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Earnings Per Share and Stockholders' Equity (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share, Basic and Diluted [Line Items]
Net income—numerator for earnings per common share		$ 36,803	$ 56,957	$ 26,946	$ 53,939	$ 120,796	$ (7,420)	$ 14,708	$ (44,841)	$ 174,645	$ 83,243	$ 219,830
Weighted average common shares outstanding (shares)	[1]									88,982,442	84,793,151	78,936,828
Effect of dilutive securities: equity forward sale agreements (shares)										0	0	67,575
Effect of dilutive securities: 2015 warrants (shares)										0	15,136	759,723
Denominator for earnings per common share - assuming dilution (shares)										90,311,008	85,605,169	80,960,568
Earnings per common share		$ 0.41	$ 0.64	$ 0.30	$ 0.61	$ 1.37	$ (0.09)	$ 0.18	$ (0.55)	$ 1.96	$ 0.98	$ 2.78
Earnings per common share - assuming dilution		$ 0.41	$ 0.63	$ 0.30	$ 0.60	$ 1.35	$ (0.09)	$ 0.18	$ (0.55)	$ 1.93	$ 0.97	$ 2.72
Stock Options And Deferred Compensation Agreements [Member]
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: share-based payment agreements (shares)										945,612	456,236	1,040,922
Restricted Stock And Restricted Stock Units [Member]
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: share-based payment agreements (shares)										382,954	340,646	155,520
[1] Weighted average common shares outstanding include shares vested under the NMO Deferred Compensation Plan.

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