Interim Consolidated Statements of Shareholders' Equity and Comprehensive Income (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2020	$ 282,675	$ 448	$ 805,140	$ (5,283,584)	$ 5,095,596	$ (334,925)
Beginning balance, shares at Dec. 31, 2020		23,471,841
Exercise of stock options and restricted stock units, shares	22,388	22,388
Share based compensation, exercise value	$ 5,049		1,239	4,682	872	0
Repurchases of common stock	$ (262,500)			(262,500)
Repurchases of common stock, shares	(224,808)	(224,808)
Adjustment to Additional Paid in Capital, Share-Based Compensation	$ 4,575		4,575
Net Income (Loss) Attributable to Parent	149,663				149,663
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	23,181					23,181
Ending balance at Mar. 31, 2021	202,643	$ 448	810,954	(5,541,402)	5,244,387	(311,744)
Ending balance, shares at Mar. 31, 2021		23,269,421
Beginning balance at Dec. 31, 2021	$ 171,421	$ 448	825,974	(6,259,049)	5,859,272	(255,224)
Beginning balance, shares at Dec. 31, 2021	22,843,103	22,843,103
Exercise of stock options and restricted stock units, shares	27,795	27,795
Share based compensation, exercise value	$ 5,289		1,020	6,669	2,400	0
Repurchases of common stock	$ (275,000)			$ (275,000)
Repurchases of common stock, shares	(190,593)	(190,593)
Adjustment to Additional Paid in Capital, Share-Based Compensation	$ 4,509		$ 4,509
Net Income (Loss) Attributable to Parent	174,001				$ 174,001
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	4,350					$ 4,350
Ending balance at Mar. 31, 2022	$ 84,570
Ending balance, shares at Mar. 31, 2022	22,680,305	22,680,305