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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2014
Accounting Policies [Abstract] |
Dilutive and Anti-Dilutive Shares for Earnings per Share [Table Text Block] | The following table details the weighted-average dilutive and anti-dilutive securities related to stock options, RSUs, PSUs, and the 3.50% Senior Convertible Notes for the years presented:
| For the Years Ended December 31,
| 2014 |  | 2013 |  | 2012
| (in thousands)
Dilutive | 814 |  |  | 1,383 |  |  | — |
Anti-dilutive | — |  |  | — |  |  | 2,102 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table sets forth the calculations of basic and diluted earnings per share:
| For the Years Ended December 31,
| 2014 |  | 2013 |  | 2012
| (in thousands, except per share amounts)
Net income (loss) | $ | 666,051 |  |  | $ | 170,935 |  |  | $ | (54,249 | )
Basic weighted-average common shares outstanding | 67,230 |  |  | 66,615 |  |  | 65,138 |
Add: dilutive effect of stock options, unvested RSUs, and contingent PSUs | 814 |  |  | 1,383 |  |  | — |
Add: dilutive effect of 3.50% Senior Convertible Notes (1) | — |  |  | — |  |  | — |
Diluted weighted-average common shares outstanding | 68,044 |  |  | 67,998 |  |  | 65,138 |
Basic net income (loss) per common share | $ | 9.91 |  |  | $ | 2.57 |  |  | $ | (0.83 | )
Diluted net income (loss) per common share | $ | 9.79 |  |  | $ | 2.51 |  |  | $ | (0.83 | )
____________________________________________ (1) For the year ended December 31, 2012, the shares into which the 3.50% Senior Convertible Notes were convertible were anti-dilutive and excluded from the calculation of diluted earnings per share.
Schedule of Comprehensive Income (Loss) [Table Text Block] | The changes in the balances of components comprising other comprehensive income (loss) are presented in the following table:
| Derivative Adjustments |  | Pension Liability Adjustments
| (in thousands)
For the year ended December 31, 2012 |  |  |
Net actuarial loss |  |  | $ | (4,680 | )
Reclassification to earnings | $ | (3,865 | ) |  | 771 |
Tax benefit | 1,601 |  |  | 1,439 |
Loss, net of tax | $ | (2,264 | ) |  | $ | (2,470 | )
For the year ended December 31, 2013 |  |  |
Net actuarial gain |  |  |  | $ | 2,766 |
Reclassification to earnings | $ | 1,777 |  |  | 1,239 |
Tax expense | (662 | ) |  | (1,522 | )
Income, net of tax | $ | 1,115 |  |  | $ | 2,483 |
For the year ended December 31, 2014 |  |  |
Net actuarial loss |  |  | $ | (10,062 | )
Reclassification to earnings | $ | — |  |  | 706 |
Tax benefit | — |  |  | 3,460 |
Loss, net of tax | $ | — |  |  | $ | (5,896 | )

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e526-108580 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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