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, 2017	$ 93,752	$ 18,547	$ 209,253	$ (14,541)	$ (119,507)
Stockholders' Equity [Roll Forward]
Net income	15,452	0	0	0	15,452
Foreign currency translation adjustment	(1,843)	0	0	(1,843)	0
Shares issued under incentive plans, net of shares withheld for tax	504	77	427	0	0
Stock compensation expense	2,692	0	2,692	0	0
Pension liability, net of tax	201	0	0	201	0
Shares issued in public offering, netof equity issuance costs	79,522	2,806	76,716	0	0
Declared dividends	(9,019)	0	0	0	(9,019)
Ending balance at Jun. 30, 2018	181,261	21,430	289,088	(16,498)	(112,759)
Beginning balance at Mar. 31, 2018	95,926	18,598	210,248	(16,375)	(116,545)
Stockholders' Equity [Roll Forward]
Net income	8,608	0	0	0	8,608
Foreign currency translation adjustment	(123)	0	0	(123)	0
Shares issued under incentive plans, net of shares withheld for tax	411	26	385	0	0
Stock compensation expense	1,739	0	1,739	0	0
Shares issued in public offering, netof equity issuance costs	79,522	2,806	76,716	0	0
Declared dividends	(4,822)	0	0	0	(4,822)
Ending balance at Jun. 30, 2018	181,261	21,430	289,088	(16,498)	(112,759)
Stockholders' Equity [Roll Forward]
Adoption of ASU | ASU 2018-02 [Member]	0	0	0	(315)	315
Beginning balance at Dec. 31, 2018	154,638	21,547	292,558	(18,280)	(141,187)
Stockholders' Equity [Roll Forward]
Net income	13,376	0	0	0	13,376
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
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)
Stockholders' Equity [Roll Forward]
Adoption of ASU | ASU 2016-02 [Member]	$ 905	$ 0	$ 0	$ 0	$ 905