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Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Cash Flows (Details)

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Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Cash Flows (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]          
Net cash provided by (used in) operating activities $ 35,007 $ 69,429 $ 199,158 $ 158,138 $ 85,835
Net cash provided by (used) in investing activities (333,216) (160,399) (840,579) (323,248) (105,315)
Net cash provided by (used in) financing activities 357,101 9,966 714,612 256,539 20,224
Net increase in cash and cash equivalents 58,892 (81,004) 73,191 91,429 744
Cash and cash equivalents at beginning of period 167,088 93,897 93,897 2,468 1,724
Cash and cash equivalents at end of period 225,980 12,893 167,088 93,897 2,468
Parent [Member]
          
Condensed Financial Statements, Captions [Line Items]          
Net cash provided by (used in) operating activities 35,682 69,101 195,734 154,329 81,651
Net cash provided by (used) in investing activities (332,807) (160,344) (838,177) (320,203) (101,042)
Net cash provided by (used in) financing activities 357,101 9,966 714,612 256,539 20,224
Net increase in cash and cash equivalents 59,976 (81,277) 72,169 90,665 833
Cash and cash equivalents at beginning of period 165,293 93,124 93,124 2,459 1,626
Cash and cash equivalents at end of period 225,269 11,847 165,293 93,124 2,459
Guarantor [Member]
          
Condensed Financial Statements, Captions [Line Items]          
Net cash provided by (used in) operating activities (675) 328 3,425 3,808 4,184
Net cash provided by (used) in investing activities (410) (55) (2,402) (3,045) (4,273)
Net cash provided by (used in) financing activities 0 0 0 0 0
Net increase in cash and cash equivalents (1,085) 273 1,023 763 (89)
Cash and cash equivalents at beginning of period 1,795 772 772 9 98
Cash and cash equivalents at end of period 710 1,045 1,795 772 9
Non-Guarantor [Member]
          
Condensed Financial Statements, Captions [Line Items]          
Net cash provided by (used in) operating activities 0 0 (1) 1 0
Net cash provided by (used) in investing activities (7,529) (67,063) (103,915) (25,858) (3,719)
Net cash provided by (used in) financing activities 7,530 67,063 103,915 25,858 3,719
Net increase in cash and cash equivalents 1 0 (1) 1 0
Cash and cash equivalents at beginning of period 0 1 1 0 0
Cash and cash equivalents at end of period 1 1 0 1 0
Eliminations [Member]
          
Condensed Financial Statements, Captions [Line Items]          
Net cash provided by (used in) operating activities 0 0 0 0 0
Net cash provided by (used) in investing activities 7,530 67,063 103,915 25,858 3,719
Net cash provided by (used in) financing activities (7,530) (67,063) (103,915) (25,858) (3,719)
Net increase in cash and cash equivalents 0 0 0 0 0
Cash and cash equivalents at beginning of period 0 0 0 0 0
Cash and cash equivalents at end of period $ 0 $ 0 $ 0 $ 0 $ 0