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Earnings (Loss) Per Share and Stockholders' Equity (Schedule of Earnings (Loss) Per Share, Basic and Diluted) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share, Basic and Diluted [Line Items]        
Net income (loss) - numerator for earnings (loss) per common share $ 26,946 $ 14,708 $ 80,885 $ (30,133)
Weighted average common shares outstanding (shares) [1] 88,897,203 82,516,927 88,772,831 82,322,919
Effect of dilutive securities: 2015 warrants (shares) 0 0 0 30,439
Denominator for earnings (loss) per common share - assuming dilution (shares) 90,112,284 83,184,137 90,044,639 83,072,816
Earnings (loss) per common share $ 0.30 $ 0.18 $ 0.91 $ (0.37)
Earnings (loss) per common share - assuming dilution $ 0.30 $ 0.18 $ 0.90 $ (0.37)
Stock Options and Deferred Compensation Agreements [Member]        
Earnings Per Share, Basic and Diluted [Line Items]        
Effect of dilutive securities: share-based payment arrangements (shares) 850,870 353,052 899,594 422,809
Restricted Stock and Restricted Stock Units [Member]        
Earnings Per Share, Basic and Diluted [Line Items]        
Effect of dilutive securities: share-based payment arrangements (shares) 364,211 314,158 372,214 296,649
[1] Weighted average common shares outstanding include shares vested under the NMO Deferred Compensation Plan.