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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share, Basic and Diluted [Line Items]
Net income - numerator for earnings per common share	$ 53,823	$ 169,328	$ 93,903	$ 140,962	$ 36,803	$ 56,957	$ 26,946	$ 53,939	$ 458,016	$ 174,645	$ 83,243
Weighted average common shares outstanding (shares)									90,347,915	88,982,442	84,793,151
Effect of dilutive securities: Warrants (shares)									0	0	15,136
Denominator for earnings per common share - assuming dilution (shares)									91,422,585	90,311,008	85,605,169
Earnings per common share	$ 0.59	$ 1.87	$ 1.04	$ 1.57	$ 0.41	$ 0.64	$ 0.30	$ 0.61	$ 5.07	$ 1.96	$ 0.98
Earnings per common share - assuming dilution	$ 0.59	$ 1.85	$ 1.03	$ 1.55	$ 0.41	$ 0.63	$ 0.30	$ 0.60	$ 5.01	$ 1.93	$ 0.97
Stock Options And Deferred Compensation Agreements
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: Share-based payment agreements (shares)									709,433	945,612	456,236
Restricted Stock And Restricted Stock Units
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: Share-based payment agreements (shares)									365,237	382,954	340,646

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