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Earnings (Loss) Per Share (Schedule of Earnings (Loss) Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share, Basic and Diluted [Line Items]
Net income (loss) - numerator for earnings (loss) per common share		$ 56,957	$ (7,420)	$ 137,842	$ (37,553)
Weighted average common shares outstanding (shares)	[1]	89,068,770	86,261,692	88,872,562	83,645,427
Effect of dilutive securities: 2015 warrants (shares)		0	0	0	20,219
Denominator for earnings (loss) per common share - assuming dilution (shares)		90,420,530	87,043,926	90,171,020	84,412,553
Earnings (loss) per common share		$ 0.64	$ (0.09)	$ 1.55	$ (0.45)
Earnings (loss) per common share - assuming dilution		$ 0.63	$ (0.09)	$ 1.53	$ (0.45)
Stock Options and Deferred Compensation Agreements [Member]
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: share-based payment arrangements (shares)		974,208	424,875	924,465	423,498
Restricted Stock and Restricted Stock Units [Member]
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: share-based payment arrangements (shares)		377,552	357,359	373,993	323,409
[1] Weighted average common shares outstanding include shares vested under the NMO Deferred Compensation Plan.

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