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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share, Basic and Diluted [Line Items]                      
Net income—numerator for earnings per common share $ 33,776 $ 97,306 $ 82,845 $ 5,903 $ 31,217 $ 67,815 $ 36,744 $ (9,753) $ 219,830 $ 126,023 $ 253,283
Weighted average common shares outstanding (shares) [1]                 78,936,828 74,431,087 65,543,895
Effect of dilutive securities: equity forward sale agreements (shares)                 67,575 0 0
Effect of dilutive securities: 2015 warrants (shares)                 759,723 1,559,646 1,184,549
Denominator for earnings per common share - assuming dilution (shares)                 80,960,568 79,893,600 75,040,646
Earnings per common share $ 0.41 $ 1.22 $ 1.07 $ 0.08 $ 0.41 $ 0.90 $ 0.49 $ (0.13) $ 2.78 $ 1.69 $ 3.86
Earnings per common share - assuming dilution $ 0.40 $ 1.19 $ 1.05 $ 0.07 $ 0.39 $ 0.85 $ 0.46 $ (0.13) $ 2.72 $ 1.58 $ 3.38
Stock Options And Deferred Compensation Agreements [Member]                      
Earnings Per Share, Basic and Diluted [Line Items]                      
Effect of dilutive securities: share-based payment agreements (shares)                 1,040,922 1,178,783 1,224,053
Restricted Stock And Restricted Stock Units [Member]                      
Earnings Per Share, Basic and Diluted [Line Items]                      
Effect of dilutive securities: share-based payment agreements (shares)                 155,520 66,926 0
Convertible Senior Notes [Member]                      
Earnings Per Share, Basic and Diluted [Line Items]                      
Effect of dilutive securities: convertible senior notes (shares)                 0 2,657,158 7,088,149
[1] Weighted average common shares outstanding include shares vested under the NMO Deferred Compensation Plan and exclude unallocated shares held by the ESOP.