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Earnings per Share (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) $ / shares shares | Mar. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2016 USD ($)
Earnings per share |  |  |
Capped Call, Cap Price | $ / shares | $ 60.00 |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 | 49 |
Calculation of basic and diluted earnings per share |  |  |
Net income (loss) | $ | $ 74,434 | $ (347,210) |
Basic weighted-average common shares outstanding | 111,258 | 68,077 |
Add: dilutive effect of stock options, unvested RSU's, and contingent PSU's | 71 | 0 |
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities | 0 | 0 |
Diluted weighted-average common shares outstanding | 111,329 | 68,077 |
Basic net income (loss) per common share | $ / shares | $ 0.67 | $ (5.10) |
Diluted net income (loss) per common share | $ / shares | $ 0.67 | $ (5.10) |
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 |  |
Convertible Debt [Member] | 1.50% Senior Convertible Notes Due 2021 [Domain] |  |  |
Earnings per share |  |  |
Debt Instrument, Face Amount | $ | $ 172,500 |  | $ 172,500
Debt Instrument, Convertible, Conversion Price | $ / shares | $ 40.50 |  |

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