Condensed Consolidated Statement of Shareholders' Equity (Unaudited) - USD ($)	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income
Beginning Balance (in shares) at Dec. 31, 2017		37,094,000
Beginning Balance at Dec. 31, 2017	$ 211,800,000	$ 400,000	$ 186,500,000	$ (21,800,000)	$ 44,800,000	$ 1,900,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	400,000		400,000
Issuance of restricted stock (in shares)		38,000
Issuance of restricted stock	0		(500,000)	500,000
Stock withheld for employee taxes (in shares)		(31,000)
Stock withheld for employee taxes	(900,000)		(500,000)	(400,000)
Proceeds from issuance of common stock (in shares)		72,000
Proceeds from issuance of common stock	800,000		(100,000)	900,000
Dividends declared	(4,100,000)				(4,100,000)
Change in cumulative translation adjustment	1,400,000					1,400,000
Net income	14,600,000				14,600,000
Ending Balance (in shares) at Mar. 31, 2018		37,173,000
Ending Balance at Mar. 31, 2018	224,000,000	$ 400,000	185,800,000	(20,800,000)	55,300,000	3,300,000
Beginning Balance (in shares) at Dec. 31, 2018		37,335,000
Beginning Balance at Dec. 31, 2018	137,700,000	$ 400,000	187,000,000	(25,100,000)	(27,600,000)	3,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	1,500,000		1,500,000
Issuance of restricted stock (in shares)		103,000
Issuance of restricted stock	0		(1,800,000)	1,800,000
Stock withheld for employee taxes (in shares)		(34,000)
Stock withheld for employee taxes	(800,000)			(800,000)
Proceeds from issuance of common stock (in shares)		3,000
Proceeds from issuance of common stock	0		0	0
Issuance of shares under employee stock purchase plan (in shares)		21,000
Issuance of shares under employee stock purchase plan	400,000		400,000.0
Dividends declared	(4,500,000)				(4,500,000)
Change in cumulative translation adjustment	0					0
Net income	9,700,000				9,700,000
Ending Balance (in shares) at Mar. 31, 2019		37,428,000
Ending Balance at Mar. 31, 2019	$ 144,000,000	$ 400,000	$ 187,100,000	$ (24,100,000)	$ (22,400,000)	$ 3,000,000