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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, 2016	Mar. 31, 2015
Earnings Per Share, Basic and Diluted [Line Items]
Net income (loss) - numerator for earnings (loss) per common share		$ (44,841)	$ 5,903
Weighted average common shares outstanding (shares)	[1]	82,128,911	77,041,704
Effect of dilutive securities: 2015 warrants (shares)		60,878	806,485
Denominator for earnings (loss) per common share - assuming dilution		82,961,495	79,118,034
Earnings (loss) per common share		$ (0.55)	$ 0.08
Earnings (loss) per common share - assuming dilution		$ (0.55)	$ 0.07
Stock Options and Deferred Compensation Agreements [Member]
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: share-based payment arrangements (shares)		492,567	1,159,334
Restricted Stock and Restricted Stock Units [Member]
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: share-based payment arrangements (shares)		279,139	110,511
[1] Weighted average common shares outstanding include shares vested under the NMO Deferred Compensation Plan.

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