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Summary of Significant Accounting Policies Earnings Per Share (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) $ / shares shares
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 256 |  | 0 | 0
Earnings Per Share Reconciliation [Abstract] |  |  |  |
Net Income (loss) | $ | $ (447,710) |  | $ 666,051 | $ 170,935
Weighted Average Number of Shares Outstanding, Basic | 67,723 |  | 67,230 | 66,615
Incremental Common Shares Attributable to Share-based Payment Arrangements | 0 | [1] | 814 | 1,383
Weighted Average Number of Shares Outstanding, Diluted | 67,723 |  | 68,044 | 67,998
Basic net income (loss) per common share | $ / shares | $ (6.61) |  | $ 9.91 | $ 2.57
Diluted net income (loss) per common share | $ / shares | $ (6.61) |  | $ 9.79 | $ 2.51
Performance Shares [Member] |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Award Vesting Period | 3 years |  |  |
Multiplier Applied to PSU Awards at Settlement | 1.0 |  | 0.55 | 1.725
Minimum [Member] | Performance Shares [Member] |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Multiplier Applied to PSU Awards at Settlement | 0 |  |  |
Maximum [Member] | Performance Shares [Member] |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Multiplier Applied to PSU Awards at Settlement | 2 |  |  |
[1] | For the year ended December 31, 2015, the shares were anti-dilutive and excluded from the calculation of diluted earnings per share.

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