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Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Operations (Details)

v2.4.0.8
Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Operations (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]                        
Total revenues $ 55,000 $ 56,603 $ 60,537 $ 66,325 $ 65,461 $ 68,946 $ 58,081 $ 55,589 $ 46,638 $ 248,926 $ 229,254 $ 127,921
Costs and expenses:                        
Lease operating expenses 5,172       5,849         24,308 20,897 17,614
Production taxes 7,287       7,769         29,400 26,333 13,966
Depletion, depreciation and amortization 22,583       21,395         90,749 62,320 38,907
General and administrative 4,412       3,009         13,808 8,074 6,063
Accretion expense 175       176         698 666 617
(Gain) Loss on sale of asset 427       0         (7,300) 0 0
Total Costs and Expenses 40,056       38,198         151,663 118,290 77,167
INCOME FROM OPERATIONS 14,944 25,875 18,178 25,947 27,263 31,585 29,118 28,156 22,105 97,263 110,964 50,754
OTHER (INCOME) EXPENSE:                        
Interest expense 3,479       153         7,458 1,400 2,761
Interest income (79)       (27)         (72) (186) (387)
(Income) loss from equity method investments (61,210)       268         (8,322) 1,418 977
Total Other (Income) Expense (57,810)       394         (936) 2,632 3,351
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES 72,754       26,869         98,199 108,332 47,403
INCOME TAX EXPENSE (BENEFIT) 28,195 10,849 15,514 0 0 (91) 0 1 0 26,363 (90) 40
INCOME (LOSS) FROM CONTINUING OPERATIONS 44,559       26,869         71,836 108,422 47,363
Discontinued Operations                   3,465 0 0
NET INCOME 44,559 15,883 502 25,117 26,869 30,974 29,009 27,265 21,174 68,371 108,422 47,363
Parent [Member]
                        
Condensed Financial Statements, Captions [Line Items]                        
Total revenues 54,662       65,165         247,637 228,281 127,380
Costs and expenses:                        
Lease operating expenses 4,998       5,645         23,644 20,168 17,043
Production taxes 7,261       7,747         29,306 26,266 13,929
Depletion, depreciation and amortization 22,583       21,395         90,749 62,320 38,902
General and administrative 4,378       2,964         13,602 8,038 6,037
Accretion expense 175       176         698 666 617
(Gain) Loss on sale of asset 427                 (7,300)    
Total Costs and Expenses 39,822       37,927         150,699 117,458 76,528
INCOME FROM OPERATIONS 14,840       27,238         96,938 110,823 50,852
OTHER (INCOME) EXPENSE:                        
Interest expense 3,479       153         7,458 1,400 2,761
Interest income (79)       (27)         (72) (39) (120)
(Income) loss from equity method investments (61,314)       243         (5,182) 1,130 808
Total Other (Income) Expense (57,914)       369         2,204 2,491 3,449
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES 72,754       26,869         94,734 108,332 47,403
INCOME TAX EXPENSE (BENEFIT) 28,195       0         26,363 (90) 40
INCOME (LOSS) FROM CONTINUING OPERATIONS                   68,371    
Discontinued Operations                   0    
NET INCOME 44,559       26,869         68,371 108,422 47,363
Guarantor [Member]
                        
Condensed Financial Statements, Captions [Line Items]                        
Total revenues 338       296         1,289 973 541
Costs and expenses:                        
Lease operating expenses 174       204         664 729 571
Production taxes 26       22         94 67 37
Depletion, depreciation and amortization 0       0         0 0 5
General and administrative 34       20         132 11 24
Accretion expense 0       0         0 0 0
(Gain) Loss on sale of asset 0                 0    
Total Costs and Expenses 234       246         890 807 637
INCOME FROM OPERATIONS 104       50         399 166 (96)
OTHER (INCOME) EXPENSE:                        
Interest expense 0       0         0 0 0
Interest income 0       0         0 0 0
(Income) loss from equity method investments 0       0         0 0 0
Total Other (Income) Expense 0       0         0 0 0
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES 104       50         399 166 (96)
INCOME TAX EXPENSE (BENEFIT) 0       0         0 0 0
INCOME (LOSS) FROM CONTINUING OPERATIONS                   399    
Discontinued Operations                   3,465    
NET INCOME 104       50         (3,066) 166 (96)
Non-Guarantor [Member]
                        
Condensed Financial Statements, Captions [Line Items]                        
Total revenues 0       0         0 0 0
Costs and expenses:                        
Lease operating expenses 0       0         0 0 0
Production taxes 0       0         0 0 0
Depletion, depreciation and amortization 0       0         0 0 0
General and administrative 0       25         74 25 2
Accretion expense 0       0         0 0 0
(Gain) Loss on sale of asset 0                 0    
Total Costs and Expenses 0       25         74 25 2
INCOME FROM OPERATIONS 0       (25)         (74) (25) (2)
OTHER (INCOME) EXPENSE:                        
Interest expense 0       0         0 0 0
Interest income 0       0         0 (147) (267)
(Income) loss from equity method investments 532       278         1,512 1,592 740
Total Other (Income) Expense 532       278         1,512 1,445 473
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (532)       (303)         (1,586) (1,470) (475)
INCOME TAX EXPENSE (BENEFIT) 0       0         0 0 0
INCOME (LOSS) FROM CONTINUING OPERATIONS                   (1,586)    
Discontinued Operations                   0    
NET INCOME (532)       (303)         (1,586) (1,470) (475)
Eliminations [Member]
                        
Condensed Financial Statements, Captions [Line Items]                        
Total revenues 0       0         0 0 0
Costs and expenses:                        
Lease operating expenses 0       0         0 0 0
Production taxes 0       0         0 0 0
Depletion, depreciation and amortization 0       0         0 0 0
General and administrative 0       0         0 0 0
Accretion expense 0       0         0 0 0
(Gain) Loss on sale of asset 0                 0    
Total Costs and Expenses 0       0         0 0 0
INCOME FROM OPERATIONS 0       0         0 0 0
OTHER (INCOME) EXPENSE:                        
Interest expense 0       0         0 0 0
Interest income 0       0         0 0 0
(Income) loss from equity method investments (428)       (253)         (4,652) (1,304) (571)
Total Other (Income) Expense (428)       (253)         (4,652) (1,304) (571)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES 428       253         4,652 1,304 571
INCOME TAX EXPENSE (BENEFIT) 0       0         0 0 0
INCOME (LOSS) FROM CONTINUING OPERATIONS                   4,652    
Discontinued Operations                   0    
NET INCOME $ 428       $ 253         $ 4,652 $ 1,304 $ 571