Interim Consolidated Statements of Shareholders' Equity and Comprehensive Income (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock, Common
Beginning balance at Dec. 31, 2021	$ 171,421	$ 448	$ 825,974	$ 5,859,272	$ (255,224)	$ (6,259,049)
Beginning balance, shares at Dec. 31, 2021		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	2,400	0	6,669
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	$ 448	831,503	6,030,873	(250,874)	(6,527,380)
Ending balance, shares at Mar. 31, 2022		22,680,305
Beginning balance at Dec. 31, 2022	$ 24,793	$ 448	850,368	6,726,866	(227,233)	(7,325,656)
Beginning balance, shares at Dec. 31, 2022	22,139,009	22,139,009
Exercise of stock options and restricted stock units, shares	47,849	47,849
Share based compensation, exercise value	$ 11,473		1,278	2,525	0	12,720
Repurchases of common stock	$ (249,999)					$ (249,999)
Repurchases of common stock, shares	(166,628)	(166,628)
Adjustment to Additional Paid in Capital, Share-Based Compensation	$ 4,027		$ 4,027
Net Income (Loss) Attributable to Parent	188,426			$ 188,426
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(1,283)				$ (1,283)
Ending balance at Mar. 31, 2023	$ (24,469)
Ending balance, shares at Mar. 31, 2023	22,680,305	22,020,230
Sales and Excise Tax Payable	$ (1,906)