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Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share, Basic and Diluted [Line Items]        
Net income - numerator for earnings per common share $ 97,306 $ 67,815 $ 186,054 $ 94,806
Weighted average common shares outstanding (shares) [1] 79,675,955 75,082,852 77,994,602 74,030,290
Effect of dilutive securities: 2015 warrants and equity forward sale agreements (shares) 714,980 1,230,020 766,795 1,730,077
Denominator for earnings per common share - assuming dilution (shares) 81,558,636 79,467,110 79,977,310 79,477,258
Earnings per common share $ 1.22 $ 0.90 $ 2.39 $ 1.28
Earnings per common share - assuming dilution $ 1.19 $ 0.85 $ 2.33 $ 1.19
Convertible Senior Notes [Member]        
Earnings Per Share, Basic and Diluted [Line Items]        
Effect of dilutive securities: convertible senior notes (shares) 0 1,982,089 0 2,485,974
Stock Options and Deferred Compensation Agreements [Member]        
Earnings Per Share, Basic and Diluted [Line Items]        
Effect of dilutive securities: share-based payment arrangements (shares) 981,271 1,115,927 1,076,166 1,185,973
Restricted Stock and Restricted Stock Units [Member]        
Earnings Per Share, Basic and Diluted [Line Items]        
Effect of dilutive securities: share-based payment arrangements (shares) 186,430 56,222 139,747 44,944
[1] Weighted average common shares outstanding include shares vested under the NMO Deferred Compensation Plan and exclude unallocated shares held by the ESOP.