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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share, Basic and Diluted [Line Items]
Net income - numerator for earnings per common share	$ 220,150	$ 37,360	$ 18,590	$ (30,010)	$ 53,823	$ 169,328	$ 93,903	$ 140,962	$ 246,090	$ 458,016	$ 174,645
Weighted average common shares outstanding (shares)									91,139,453	90,347,915	88,982,442
Denominator for earnings per common share - assuming dilution (shares)									91,782,242	91,422,585	90,311,008
Earnings per common share	$ 2.41	$ 0.41	$ 0.20	$ (0.33)	$ 0.59	$ 1.87	$ 1.04	$ 1.57	$ 2.70	$ 5.07	$ 1.96
Earnings per common share - assuming dilution	$ 2.40	$ 0.41	$ 0.20	$ (0.33)	$ 0.59	$ 1.85	$ 1.03	$ 1.55	$ 2.68	$ 5.01	$ 1.93
Stock Options And Deferred Compensation Agreements
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: Share-based payment agreements (shares)									304,196	709,433	945,612
Restricted Stock And Restricted Stock Units
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: Share-based payment agreements (shares)									338,593	365,237	382,954
Stock Options
Earnings Per Share, Basic and Diluted [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount									0	0	0