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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
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.