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	13,376		0		0		0		13,376
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	1,535		0		0		1,535		0
Shares issued under incentive plans, net of shares withheld for tax	(613)		99		(712)		0		0
Stock compensation expense	2,220		0		2,220		0		0
Declared dividends	(9,651)		0		0		0		(9,651)
Ending balance at Jun. 30, 2019	162,410		21,646		294,066		(16,745)		(136,557)
Beginning balance at Mar. 31, 2019	158,426		21,627		292,608		(17,503)		(138,306)
Stockholders' Equity [Roll Forward]
Net income	6,606		0		0		0		6,606
Beginning balance at Mar. 31, 2019	158,426		21,627		292,608		(17,503)		(138,306)
Stockholders' Equity [Roll Forward]
Foreign currency translation adjustment	758		0		0		758		0
Shares issued under incentive plans, net of shares withheld for tax	215		19		196		0		0
Stock compensation expense	1,262		0		1,262		0		0
Declared dividends	(4,857)		0		0		0		(4,857)
Ending balance at Jun. 30, 2019	162,410		21,646		294,066		(16,745)		(136,557)
Beginning balance at Dec. 31, 2019	166,682		21,785		296,363		(16,349)		(135,117)
Stockholders' Equity [Roll Forward]
Net income	25,094		0		0		0		25,094
Beginning balance at Dec. 31, 2019	166,682		21,785		296,363		(16,349)		(135,117)
Stockholders' Equity [Roll Forward]
Foreign currency translation adjustment	(1,535)		0		0		(1,535)		0
Shares issued under incentive plans, net of shares withheld for tax	(127)		60		(187)		0		0
Stock compensation expense	1,346		0		1,346		0		0
Declared dividends	(9,765)		0		0		0		(9,765)
Ending balance at Jun. 30, 2020	181,695		21,845		297,522		(17,884)		(119,788)
Beginning balance at Mar. 31, 2020	176,223		21,828		296,736		(19,104)		(123,237)
Stockholders' Equity [Roll Forward]
Net income	8,368		0		0		0		8,368
Beginning balance at Mar. 31, 2020	176,223		21,828		296,736		(19,104)		(123,237)
Stockholders' Equity [Roll Forward]
Foreign currency translation adjustment	1,220		0		0		1,220		0
Shares issued under incentive plans, net of shares withheld for tax	110		17		93		0		0
Stock compensation expense	693		0		693		0		0
Declared dividends	(4,919)		0		0		0		(4,919)
Ending balance at Jun. 30, 2020	$ 181,695		$ 21,845		$ 297,522		$ (17,884)		$ (119,788)