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Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share, Basic and Dilutive [Line Items]        
Net income $ 36,744 $ 120,113 $ 26,991 $ 146,144
Weighted average common shares outstanding (shares) 74,461,264 [1] 64,254,387 [1] 73,495,286 [1] 63,786,577 [1]
Effect of dilutive securities: 2015 warrants (shares) 1,595,519 0 1,981,815 0
Denominator for earnings per common share - assuming dilution (shares) 79,517,804 70,382,065 79,582,763 69,882,240
Earnings per common share $ 0.49 $ 1.87 $ 0.37 $ 2.29
Earnings per common share - assuming dilution $ 0.46 $ 1.71 $ 0.34 $ 2.09
Stock Options and Deferred Compensation Agreements [Member]
        
Earnings Per Share, Basic and Dilutive [Line Items]        
Effect of dilutive securities: share-based payment arrangements (shares) 1,154,726 1,118,056 1,220,996 1,013,455
Restricted Stock Units [Member]
        
Earnings Per Share, Basic and Dilutive [Line Items]        
Effect of dilutive securities: share-based payment arrangements (shares) 46,870 0 40,679 0
Convertible Senior Notes [Member]
        
Earnings Per Share, Basic and Dilutive [Line Items]        
Effect of dilutive securities: convertible senior notes (shares) 2,259,425 5,009,622 2,843,987 5,082,208
[1] Weighted average common shares outstanding include shares vested under the NMO Deferred Compensation Plan and exclude unallocated shares held by the ESOP.