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Earnings Per Share and Stockholders' Equity (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income—numerator for earnings per common share |  | $ 120,796 | $ (7,420) | $ 14,708 | $ (44,841) | $ 33,776 | $ 97,306 | $ 82,845 | $ 5,903 | $ 83,243 | $ 219,830 | $ 126,023
Weighted average common shares outstanding (shares) | [1] |  |  |  |  |  |  |  |  | 84,793,151 | 78,936,828 | 74,431,087
Effect of dilutive securities: convertible senior notes (shares) |  |  |  |  |  |  |  |  |  | 0 | 0 | 2,657,158
Effect of dilutive securities: equity forward sale agreements (shares) |  |  |  |  |  |  |  |  |  | 0 | 67,575 | 0
Effect of dilutive securities: 2015 warrants (shares) |  |  |  |  |  |  |  |  |  | 15,136 | 759,723 | 1,559,646
Denominator for earnings per common share - assuming dilution (shares) |  |  |  |  |  |  |  |  |  | 85,605,169 | 80,960,568 | 79,893,600
Earnings per common share |  | $ 1.37 | $ (0.09) | $ 0.18 | $ (0.55) | $ 0.41 | $ 1.22 | $ 1.07 | $ 0.08 | $ 0.98 | $ 2.78 | $ 1.69
Earnings per common share - assuming dilution |  | $ 1.35 | $ (0.09) | $ 0.18 | $ (0.55) | $ 0.40 | $ 1.19 | $ 1.05 | $ 0.07 | $ 0.97 | $ 2.72 | $ 1.58
Stock Options And Deferred Compensation Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive securities: share-based payment agreements (shares) |  |  |  |  |  |  |  |  |  | 456,236 | 1,040,922 | 1,178,783
Restricted Stock And Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive securities: share-based payment agreements (shares) |  |  |  |  |  |  |  |  |  | 340,646 | 155,520 | 66,926
[1] | Weighted average common shares outstanding include shares vested under the NMO Deferred Compensation Plan and exclude unallocated shares held by the ESOP.

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