Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2015	$ 242,567	$ 26	$ 124,834	$ 181,539	$ (63,832)
Beginning balance (in shares) at Dec. 31, 2015		25,773
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and vesting of restricted stock	1,072		1,072
Stock-based compensation and vesting of restricted stock (in shares)		12
Net income	8,810			8,810
Dividends declared	(3,908)			(3,908)
Change in fair value of interest rate swap, net of tax	0
Cumulative foreign currency translation adjustment	4,189				4,189
Repurchases of common stock	(2,159)		(2,159)
Repurchases of common stock (in shares)		(91)
Ending balance at Mar. 31, 2016	250,571	$ 26	123,747	186,441	(59,643)
Ending balance (in shares) at Mar. 31, 2016		25,694
Beginning balance at Dec. 31, 2016	283,348	$ 27	168,299	191,108	(76,086)
Beginning balance (in shares) at Dec. 31, 2016		27,206
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and vesting of restricted stock	1,588		1,588
Stock-based compensation and vesting of restricted stock (in shares)		31
Net income	10,326			10,326
Conversion of Convertible Debt	51,851	$ 2	51,849
Conversion of Convertible Debt (in shares)		1,748
Dividends declared	(4,396)			(4,396)
Change in fair value of interest rate swap, net of tax	818				818
Cumulative foreign currency translation adjustment	3,912				3,912
Ending balance at Mar. 31, 2017	$ 347,447	$ 29	$ 221,736	$ 197,038	$ (71,356)
Ending balance (in shares) at Mar. 31, 2017		28,985