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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
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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)

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