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Earnings per Share (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) $ / shares shares | Jun. 30, 2015 USD ($) $ / shares shares | Jun. 30, 2016 USD ($) $ / shares shares | Jun. 30, 2015 USD ($) $ / shares shares
Earnings per share |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 155,000 | 590,000 | 70,000 | 490,000
Calculation of basic and diluted earnings per share |  |  |  |
Net loss | $ | $ (168,681) | $ (57,508) | $ (515,891) | $ (110,566)
Basic weighted-average common shares outstanding | 68,102,000 | 67,483,000 | 68,090,000 | 67,473,000
Add: dilutive effect of stock options, unvested RSU's, and contingent PSU's | 0 | 0 | 0 | 0
Diluted weighted-average common shares outstanding | 68,102,000 | 67,483,000 | 68,090,000 | 67,473,000
Basic net loss per common share | $ / shares | $ (2.48) | $ (0.85) | $ (7.58) | $ (1.64)
Diluted net loss per common share | $ / shares | $ (2.48) | $ (0.85) | $ (7.58) | $ (1.64)
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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