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Condensed Consolidating Financial Statements - Condensed Consolidating Statements of Comprehenisve Income (Loss) (Details)

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Condensed Consolidating Financial Statements - Condensed Consolidating Statements of Comprehenisve Income (Loss) (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]                        
Net income (loss) $ 44,559 $ 15,883 $ 502 $ 25,117 $ 26,869 $ 30,974 $ 29,009 $ 27,265 $ 21,174 $ 68,371 $ 108,422 $ 47,363
Foreign currency translation adjustment (3,567)       939         1,355 (1,865) 2,255
Change in fair value of derivative instruments, net of taxes (1,430)       (10,621)         (8,452) 1,576 (4,720)
Reclassification of settled contracts, net of taxes 1,797       (100)         1,005 4,720 18,736
Other comprehensive income (loss) (3,200)       (9,782)         (6,092) 4,431 16,271
Comprehensive income 41,359       17,087         62,279 112,853 63,634
Parent [Member]
                        
Condensed Financial Statements, Captions [Line Items]                        
Net income (loss) 44,559       26,869         68,371 108,422 47,363
Foreign currency translation adjustment (3,567)       939         1,355 (1,865) 2,255
Change in fair value of derivative instruments, net of taxes (1,430)       (10,621)         (8,452) 1,576 (4,720)
Reclassification of settled contracts, net of taxes 1,797       (100)         1,005 4,720 18,736
Other comprehensive income (loss) (3,200)       (9,782)         (6,092) 4,431 16,271
Comprehensive income 41,359       17,087         62,279 112,853 63,634
Guarantor [Member]
                        
Condensed Financial Statements, Captions [Line Items]                        
Net income (loss) 104       50         (3,066) 166 (96)
Foreign currency translation adjustment 0       0         0 0 0
Change in fair value of derivative instruments, net of taxes 0       0         0 0 0
Reclassification of settled contracts, net of taxes 0       0         0 0 0
Other comprehensive income (loss) 0       0         0 0 0
Comprehensive income 104       50         (3,066) 166 (96)
Non-Guarantor [Member]
                        
Condensed Financial Statements, Captions [Line Items]                        
Net income (loss) (532)       (303)         (1,586) (1,470) (475)
Foreign currency translation adjustment (3,567)       939         1,355 (1,865) 2,255
Change in fair value of derivative instruments, net of taxes 0       0         0 0 0
Reclassification of settled contracts, net of taxes 0       0         0 0 0
Other comprehensive income (loss) (3,567)       939         1,355 (1,865) 2,255
Comprehensive income (4,099)       636         (231) (3,335) 1,780
Eliminations [Member]
                        
Condensed Financial Statements, Captions [Line Items]                        
Net income (loss) 428       253         4,652 1,304 571
Foreign currency translation adjustment 3,567       (939)         (1,355) 1,865 (2,255)
Change in fair value of derivative instruments, net of taxes 0       0         0 0 0
Reclassification of settled contracts, net of taxes 0       0         0 0 0
Other comprehensive income (loss) 3,567       (939)         (1,355) 1,865 (2,255)
Comprehensive income $ 3,995       $ (686)         $ 3,297 $ 3,169 $ (1,684)