Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total		Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2017	$ 179,189		$ 0	$ 179,448	$ (259)
Balance, shares at Dec. 31, 2017			30,305
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	8,059	[1],[2]		8,059
Unrealized gain (loss) on marketable securities, net of income tax benefit	(37)	[1]			(37)
Gain (loss) on derivative securities, effective portion, net of income tax expense	144	[1]			144
Foreign currency translation adjustment, including income tax expense (benefit)	(117)	[1]			(117)
Stock-based compensation expense	479		$ 479	0
Common stock issued under equity compensation plan, shares			67
Common stock issued under equity compensation plan, net of shares withheld for tax payments			$ (99)
Repurchased shares, in shares			(211)
Repurchased shares	(2,718)		$ (150)	(2,568)
Balance, shares at Mar. 31, 2018			30,161
Ending balance at Mar. 31, 2018	184,900		$ 230	184,939	(269)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	(99)
Beginning balance at Dec. 31, 2018	182,596		$ 215	183,290	(909)
Balance, shares at Dec. 31, 2018			29,545
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(8,575)			(8,575)
Unrealized gain (loss) on marketable securities, net of income tax benefit	15				15
Gain (loss) on derivative securities, effective portion, net of income tax expense	(100)				(100)
Foreign currency translation adjustment, including income tax expense (benefit)	128				128
Stock-based compensation expense	(365)		$ (147)	(218)
Common stock issued under equity compensation plan, shares			48
Common stock issued under equity compensation plan, net of shares withheld for tax payments			$ (68)
Repurchased shares	(1,000)
Balance, shares at Mar. 31, 2019			29,593
Ending balance at Mar. 31, 2019	173,631		$ 0	$ 174,497	$ (866)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	$ (68)

[1]

[2] May not add due to rounding.