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Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Aug. 20, 2018
Earnings Per Common Share [Line Items]
Conversion price (in dollars per share)	$ 101.38						$ 101.38
Numerator — basic and diluted
Net income	$ 60,422	$ 64,598	$ 62,645	$ 44,333	$ 43,609	$ 38,945	$ 187,665	$ 126,887
Denominator
Weighted average number of common shares outstanding — basic (in shares)	36,617			37,318			36,851	37,008
Effect of dilutive convertible notes (in shares)	21			0			7	0
Effect of dilutive stock options (in shares)	471			639			454	500
Effect of dilutive restricted shares (in shares)	829			799			795	706
Weighted average number of common shares outstanding — diluted (in shares)	37,938			38,756			38,107	38,214
Earnings per common share — basic (in dollars per share)	$ 1.65			$ 1.19			$ 5.09	$ 3.43
Earnings per common share — diluted (in dollars per share)	$ 1.59			$ 1.14			$ 4.92	$ 3.32
Stock Options And Restricted Shares
Denominator
Antidilutive stock options and restricted shares (in shares)	1			4			24	221
Senior Notes | Convertible Note Due 2023
Earnings Per Common Share [Line Items]
Interest rate (as a percent)	2.00%						2.00%
Conversion price (in dollars per share)									$ 101.38

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