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Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share, Basic and Diluted [Line Items]
Net income - numerator for earnings per common share	$ 37,360	$ 169,328	$ 25,940	$ 404,193
Weighted average common shares outstanding (shares)	91,251,590	90,485,567	91,080,681	90,278,209
Denominator for earnings per common share - assuming dilution (shares)	91,710,557	91,650,886	91,747,862	91,355,410
Earnings per common share	$ 0.41	$ 1.87	$ 0.28	$ 4.48
Earnings per common share - assuming dilution	$ 0.41	$ 1.85	$ 0.28	$ 4.42
Stock Options and Deferred Compensation Agreements
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: share-based payment arrangements (shares)	190,137	705,465	326,306	750,588
Restricted Stock and Restricted Stock Units
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: share-based payment arrangements (shares)	268,830	459,854	340,875	326,613
Stock Options
Earnings Per Share, Basic and Diluted [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (shares)	551,585	0	0	0
Antidilutive securities excluded from computation of earnings per share, exercise price	$ 24.79

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