Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect Period of Adoption Adjustment [Member]	Common Shares [Member]	Common Shares [Member] Cumulative Effect Period of Adoption Adjustment [Member]	Additional Paid-In Capital [Member]	Additional Paid-In Capital [Member] Cumulative Effect Period of Adoption Adjustment [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Cumulative Effect Period of Adoption Adjustment [Member]	Retained Deficit [Member]	Retained Deficit [Member] Cumulative Effect Period of Adoption Adjustment [Member]
Beginning balance at Dec. 31, 2018	$ 154,638	$ 905	$ 21,547	$ 0	$ 292,558	$ 0	$ (18,280)	$ 0	$ (141,187)	$ 905
Stockholders' Equity [Roll Forward]
Net income	18,595		0		0		0		18,595
Beginning balance at Dec. 31, 2018	154,638	$ 905	21,547	$ 0	292,558	$ 0	(18,280)	$ 0	(141,187)	$ 905
Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201602Member								us-gaap:AccountingStandardsUpdate201602Member
Foreign currency translation adjustment	1,069		0		0		1,069		0
Shares issued under incentive plans, net of shares withheld for tax	(230)		116		(346)		0		0
Stock compensation expense	3,348		0		3,348		0		0
Declared dividends	(14,505)		0		0		0		(14,505)
Ending balance at Sep. 30, 2019	163,820		21,663		295,560		(17,211)		(136,192)
Beginning balance at Jun. 30, 2019	162,410		21,646		294,066		(16,745)		(136,557)
Stockholders' Equity [Roll Forward]
Net income	5,219		0		0		0		5,219
Beginning balance at Jun. 30, 2019	162,410		21,646		294,066		(16,745)		(136,557)
Stockholders' Equity [Roll Forward]
Foreign currency translation adjustment	(466)		0		0		(466)		0
Shares issued under incentive plans, net of shares withheld for tax	383		17		366		0		0
Stock compensation expense	1,128		0		1,128		0		0
Declared dividends	(4,854)		0		0		0		(4,854)
Ending balance at Sep. 30, 2019	163,820		21,663		295,560		(17,211)		(136,192)
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
Beginning balance at Dec. 31, 2019	166,682		21,785		296,363		(16,349)		(135,117)
Stockholders' Equity [Roll Forward]
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
Beginning balance at Jun. 30, 2020	181,695		21,845		297,522		(17,884)		(119,788)
Stockholders' Equity [Roll Forward]
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)