CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Common Stock Held in Treasury
Balance at beginning of period (shares) at Dec. 31, 2020		49,276				8,238
Balance at beginning of period at Dec. 31, 2020	$ 1,283,815	$ 493	$ 1,221,788	$ 789,303	$ (118,432)	$ (609,337)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under share-based compensation plan	(1,663)		(7,090)			$ 5,427
Shares issued under share-based compensation plan (shares)						(73)
Share-based compensation expense	3,625		3,625
Net income	33,715			33,715
Cash dividends	(11,097)			(11,097)
Currency translation adjustment	(12,335)				(12,335)
Purchases of treasury stock (shares)						84
Purchases of treasury stock	(4,967)					$ (4,967)
Balance at end of period (shares) at Mar. 31, 2021		49,276				8,249
Balance at end of period at Mar. 31, 2021	1,291,093	$ 493	1,218,323	811,921	(130,767)	$ (608,877)
Balance at beginning of period (shares) at Dec. 31, 2020		49,276				8,238
Balance at beginning of period at Dec. 31, 2020	1,283,815	$ 493	1,221,788	789,303	(118,432)	$ (609,337)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	62,142
Balance at end of period (shares) at Jun. 30, 2021		49,276				8,701
Balance at end of period at Jun. 30, 2021	1,290,816	$ 493	1,219,948	828,040	(115,790)	$ (641,875)
Balance at beginning of period (shares) at Mar. 31, 2021		49,276				8,249
Balance at beginning of period at Mar. 31, 2021	1,291,093	$ 493	1,218,323	811,921	(130,767)	$ (608,877)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	1,625		1,625
Net income	28,427			28,427
Cash dividends	(12,308)			(12,308)
Currency translation adjustment	14,977				14,977
Purchases of treasury stock (shares)						452
Purchases of treasury stock	(32,998)					$ (32,998)
Balance at end of period (shares) at Jun. 30, 2021		49,276				8,701
Balance at end of period at Jun. 30, 2021	1,290,816	$ 493	1,219,948	828,040	(115,790)	$ (641,875)
Balance at beginning of period (shares) at Dec. 31, 2021		57,322				8,843
Balance at beginning of period at Dec. 31, 2021	1,808,127	$ 573	1,724,956	866,679	(131,299)	$ (652,782)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under share-based compensation plan	0		(1,281)			$ 1,281
Shares issued under share-based compensation plan (shares)						(17)
Share-based compensation expense	3,075		3,075
Net income	28,005			28,005
Cash dividends	(14,546)			(14,546)
Currency translation adjustment	11,789				11,789
Purchases of treasury stock (shares)						1,048
Purchases of treasury stock	(72,217)					$ (72,217)
Balance at end of period (shares) at Mar. 31, 2022		57,322				9,874
Balance at end of period at Mar. 31, 2022	1,764,233	$ 573	1,726,750	880,138	(119,510)	$ (723,718)
Balance at beginning of period (shares) at Dec. 31, 2021		57,322				8,843
Balance at beginning of period at Dec. 31, 2021	1,808,127	$ 573	1,724,956	866,679	(131,299)	$ (652,782)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	114,113
Balance at end of period (shares) at Jun. 30, 2022		57,322				10,175
Balance at end of period at Jun. 30, 2022	1,817,998	$ 573	1,729,625	952,011	(119,994)	$ (744,217)
Balance at beginning of period (shares) at Mar. 31, 2022		57,322				9,874
Balance at beginning of period at Mar. 31, 2022	1,764,233	$ 573	1,726,750	880,138	(119,510)	$ (723,718)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	2,875		2,875
Net income	86,108			86,108
Cash dividends	(14,235)			(14,235)
Currency translation adjustment	(484)				(484)
Purchases of treasury stock (shares)						301
Purchases of treasury stock	(20,499)					$ (20,499)
Balance at end of period (shares) at Jun. 30, 2022		57,322				10,175
Balance at end of period at Jun. 30, 2022	$ 1,817,998	$ 573	$ 1,729,625	$ 952,011	$ (119,994)	$ (744,217)