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Earnings per Share (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) $ / shares shares | Jun. 30, 2016 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) $ / shares shares | Jun. 30, 2016 USD ($) $ / shares shares | Dec. 31, 2016 USD ($)
Earnings per share |  |  |  |  |
Capped Call, Cap Price | $ / shares | $ 60.00 |  | $ 60.00 |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 44 | 155 | 59 | 70 |
Calculation of basic and diluted earnings per share |  |  |  |  |
Net loss | $ | $ (119,907) | $ (168,681) | $ (45,473) | $ (515,891) |
Basic weighted-average common shares outstanding | 111,277 | 68,102 | 111,274 | 68,090 |
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements | 0 | 0 | 0 | 0 |
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities, Treasury Stock Method | 0 | 0 | 0 | 0 |
Diluted weighted-average common shares outstanding | 111,277 | 68,102 | 111,274 | 68,090 |
Basic net income (loss) per common share | $ / shares | $ (1.08) | $ (2.48) | $ (0.41) | $ (7.58) |
Diluted net income (loss) per common share | $ / shares | $ (1.08) | $ (2.48) | $ (0.41) | $ (7.58) |
Minimum [Member] | Performance Shares [Member] |  |  |  |  |
Earnings per share |  |  |  |  |
Multiplier Applied to PSU Awards at Settlement |  |  | 0.00 |  |
Maximum [Member] | Performance Shares [Member] |  |  |  |  |
Earnings per share |  |  |  |  |
Multiplier Applied to PSU Awards at Settlement |  |  | 2.00 |  |
Convertible Debt [Member] | 1.50% Senior Convertible Notes Due 2021 [Domain] |  |  |  |  |
Earnings per share |  |  |  |  |
Debt Instrument, Face Amount | $ | $ 172,500 |  | $ 172,500 |  | $ 172,500
Debt Instrument, Convertible, Conversion Price | $ / shares | $ 40.50 |  | $ 40.50 |  |

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