CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common stock	Paid-in capital	Treasury stock	Accumulated other comprehensive income (loss)	Retained earnings
Balance, beginning of period at Dec. 31, 2018		$ 371,353	$ 1,862,536	$ (175,059)	$ (124,214)	$ 1,647,275
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reissuance of treasury stock, net under share-based compensation plans			(11,582)	5,930
Equity compensation			5,282
Repurchase of common stock				0
Other comprehensive (loss) income, net of tax	$ 82,721				82,721
Net income	151,941					151,941
Cash dividends						0
Balance, end of period at Mar. 31, 2019	3,816,183	371,353	1,856,236	(169,129)	(41,493)	1,799,216
Balance, beginning of period at Dec. 31, 2019	4,309,234	371,353	1,869,719	(283,196)	72,708	2,278,650
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reissuance of treasury stock, net under share-based compensation plans			(18,667)	9,768
Equity compensation			4,319
Repurchase of common stock				(119,997)
Other comprehensive (loss) income, net of tax	(71,484)				(71,484)
Net income	149,805					149,805
Cash dividends						(21,150)
Balance, end of period at Mar. 31, 2020	$ 4,241,828	$ 371,353	$ 1,855,371	$ (393,425)	$ 1,224	$ 2,407,305