UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Shares of Common Stock (no par value)	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2020		49,868
Beginning balance at Dec. 31, 2020	$ 577,051		$ 47,317	$ 534,440	$ (4,706)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	51,417			51,417
Net gain on interest rate swaps, net of tax	773				773
Stock based compensation (in shares)		109
Stock based compensation	746		746
Common stock issued	8		8
Shares retired for settlement of employee taxes upon issuance of vested equity awards (in shares)		(33)
Shares retired for settlement of employee taxes upon issuance of vested equity awards	(1,486)		(1,486)
Ending balance (in shares) at Mar. 31, 2021		49,944
Ending balance at Mar. 31, 2021	$ 628,509		46,585	585,857	(3,933)
Beginning balance (in shares) at Dec. 31, 2021	49,965	49,965
Beginning balance at Dec. 31, 2021	$ 642,275		49,351	592,924	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(603)			(603)
Stock based compensation (in shares)		110
Stock based compensation	3,252		3,252
Common stock issued (in shares)		1
Common stock issued	8		8
Shares retired for settlement of employee taxes upon issuance of vested equity awards (in shares)		(27)
Shares retired for settlement of employee taxes upon issuance of vested equity awards	$ (603)		(603)
Ending balance (in shares) at Mar. 31, 2022	50,049	50,049
Ending balance at Mar. 31, 2022	$ 644,329		$ 52,008	$ 592,321	$ 0