CONDENSED CONSOLIDATED STATEMENT 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, 2020		$ 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		28	(2,660)
Shares issued for employee stock purchase plan		7	697
Equity compensation expense			4,006
Net income	$ 31,218			31,218
Other comprehensive income (loss)	(13,196)				(13,196)
Balance, end of period at Mar. 31, 2021	1,040,855	18,712	150,004	904,910	(32,771)
Balance, beginning 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		67	(10,565)
Shares issued for employee stock purchase plan		6	944
Equity compensation expense			3,202
Net income	16,600			16,600
Other comprehensive income (loss)	(11,671)				(11,671)
Balance, end of period at Mar. 31, 2022	$ 1,117,478	$ 18,803	$ 157,164	$ 998,425	$ (56,914)