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Earnings per Share (Details) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 USD ($) $ / shares shares | Mar. 31, 2015 USD ($) $ / shares shares
Earnings per share |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 49,000 | 452,000
Calculation of basic and diluted earnings per share |  |
Net loss | $ | $ (347,210) | $ (53,058)
Basic weighted-average common shares outstanding | 68,077,000 | 67,463,000
Add: dilutive effect of stock options, unvested RSU's, and contingent PSU's | 0 | 0
Diluted weighted-average common shares outstanding | 68,077,000 | 67,463,000
Basic net loss per common share | $ / shares | $ (5.10) | $ (0.79)
Diluted net loss per common share | $ / shares | $ (5.10) | $ (0.79)
Performance Shares [Member] |  |
Earnings per share |  |
Share-based Compensation, Awards Other Than Options, Performance Measurement Period | 3 years |
Minimum [Member] | Performance Shares [Member] |  |
Earnings per share |  |
Multiplier Applied to PSU Awards at Settlement | 0 |
Maximum [Member] | Performance Shares [Member] |  |
Earnings per share |  |
Multiplier Applied to PSU Awards at Settlement | 2.00 |

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