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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
		Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share, Basic and Diluted [Line Items]
Net income (loss) - numerator for earnings (loss) per common share		$ 53,939	$ (44,841)
Weighted average common shares outstanding (shares)	[1]	88,647,078	82,128,911
Effect of dilutive securities: 2015 warrants (shares)		0	60,878
Denominator for earnings (loss) per common share - assuming dilution		89,975,612	82,961,495
Earnings (loss) per common share		$ 0.61	$ (0.55)
Earnings (loss) per common share - assuming dilution		$ 0.60	$ (0.55)
Stock Options and Deferred Compensation Agreements [Member]
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: share-based payment arrangements (shares)		948,317	492,567
Restricted Stock and Restricted Stock Units [Member]
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: share-based payment arrangements (shares)		380,217	279,139
[1] Weighted average common shares outstanding include shares vested under the NMO Deferred Compensation Plan.

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