Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Additional Paid-In Capital	Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASC 606 (Note 2) | Accounting Standards Update 2014-09	$ (286)					$ (286)
Beginning balance, shares (in shares) at Dec. 31, 2017	28,860,961	28,860,961
Beginning balance, Treasury stock, shares (in shares) at Dec. 31, 2017	(711,231)		(711,231)
Beginning balance, amount at Dec. 31, 2017	$ 231,266	$ 288	$ (6,540)	$ (26)	$ 174,697	62,847
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 1,710				1,710
Exercise of stock options (in shares)	488,303	488,303
Exercise of stock options	$ 2,815	$ 5			2,810
Issuance of restricted stock (in shares)		333,864
Issuance of restricted stock	0	$ 3			(3)
Forfeiture of restricted stock (in shares)		(5,285)
Forfeiture of restricted stock	0
Cash flow hedge (net of tax)	383			383
Net loss	$ (6)					(6)
Ending balance, shares (in shares) at Sep. 30, 2018	29,677,843
Ending balance, Treasury stock, shares (in shares) at Sep. 30, 2018	(711,231)		(711,231)
Ending balance, amount at Sep. 30, 2018	$ 235,882	$ 296	$ (6,540)	$ 357	$ 179,214	$ 62,555