Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Shares [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Deficit [Member]
Beginning balance at Dec. 31, 2019	$ 166,682	$ 21,785	$ 296,363	$ (16,349)	$ (135,117)
Stockholders' Equity [Roll Forward]
Net income	33,779	0	0	0	33,779
Foreign currency translation adjustment	(924)	0	0	(924)	0
Shares issued under incentive plans, net of shares withheld for tax	(50)	73	(123)	0	0
Stock compensation expense	2,763	0	2,763	0	0
Declared dividends	(14,652)	0	0	0	(14,652)
Ending balance at Sep. 30, 2020	187,598	21,858	299,003	(17,273)	(115,990)
Beginning balance at Jun. 30, 2020	181,695	21,845	297,522	(17,884)	(119,788)
Stockholders' Equity [Roll Forward]
Net income	8,685	0	0	0	8,685
Foreign currency translation adjustment	611	0	0	611	0
Shares issued under incentive plans, net of shares withheld for tax	77	13	64	0	0
Stock compensation expense	1,417	0	1,417	0	0
Declared dividends	(4,887)	0	0	0	(4,887)
Ending balance at Sep. 30, 2020	187,598	21,858	299,003	(17,273)	(115,990)
Beginning balance at Dec. 31, 2020	189,100	21,939	300,852	(15,773)	(117,918)
Stockholders' Equity [Roll Forward]
Net income	26,283	0	0	0	26,283
Foreign currency translation adjustment	7	0	0	7	0
Shares issued under incentive plans, net of shares withheld for tax	2,383	211	2,172	0	0
Stock compensation expense	2,601	0	2,601	0	0
Declared dividends	(14,849)	0	0	0	(14,849)
Ending balance at Sep. 30, 2021	205,525	22,150	305,625	(15,766)	(106,484)
Beginning balance at Jun. 30, 2021	201,981	22,109	304,183	(14,892)	(109,419)
Stockholders' Equity [Roll Forward]
Net income	7,903	0	0	0	7,903
Foreign currency translation adjustment	(874)	0	0	(874)	0
Shares issued under incentive plans, net of shares withheld for tax	711	41	670	0	0
Stock compensation expense	772	0	772	0	0
Declared dividends	(4,968)	0	0	0	(4,968)
Ending balance at Sep. 30, 2021	$ 205,525	$ 22,150	$ 305,625	$ (15,766)	$ (106,484)