CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Capital Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Balance, beginning of period at Dec. 31, 2019		$ 18,577	$ 138,526	$ 823,702	$ (46,905)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for vested restricted stock units, net of shares withheld for taxes		82	(5,439)
Shares issued for employee stock purchase plan		13	1,347
Shares issued to directors		5	(5)
Equity compensation expense			13,532
Net income	$ 49,990			49,990
Other comprehensive income (loss)	27,330				27,330
Balance, end of period at Dec. 31, 2020	1,020,755	18,677	147,961	873,692	(19,575)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for vested restricted stock units, net of shares withheld for taxes		29	(2,910)
Shares issued for employee stock purchase plan		14	1,548
Shares issued to directors		10	(10)
Equity compensation expense			16,994
Net income	108,133			108,133
Other comprehensive income (loss)	(25,668)				(25,668)
Balance, end of period at Dec. 31, 2021	1,118,895	18,730	163,583	981,825	(45,243)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for vested restricted stock units, net of shares withheld for taxes		69	(10,852)
Shares issued for employee stock purchase plan		6	944
Shares issued to directors		7	(7)
Equity compensation expense			11,796
Shares repurchased	(25,000)	(238)	(24,762)
Net income	116,629			116,629
Other comprehensive income (loss)	(40,021)				(40,021)
Balance, end of period at Dec. 31, 2022	$ 1,172,466	$ 18,574	$ 140,702	$ 1,098,454	$ (85,264)