Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Balance at Dec. 31, 2012	$ 242,952	$ 6	$ (67,071)	$ 198,118	$ 273	$ 111,626
Balance (in shares) at Dec. 31, 2012		60,736,000	10,535,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(8,660)					(8,660)
Total other comprehensive income	2,504				2,504
Comprehensive income (loss)	(6,156)
Issuance of common stock upon exercise of stock awards	$ 1,594	$ 0		1,594
Issuance of common stock upon exercise of stock awards (in shares)	415,000	660,000
Issuance of treasury shares as consideration for acquisition	$ 5,211		$ 4,759	490		(38)
Issuance of treasury shares as consideration for acquisition (in shares)			422,000
Excess tax benefit derived from stock award exercises	(2,893)			(2,893)
Stock-based compensation expense	4,733			4,733
Balance at Dec. 31, 2013	245,441	$ 6	$ (62,312)	202,042	2,777	102,928
Balance (in shares) at Dec. 31, 2013		61,396,000	10,113,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	44,462					44,462
Total other comprehensive income	(8,178)				(8,178)
Comprehensive income (loss)	36,284
Issuance of common stock upon exercise of stock awards	$ 182	$ 0		182
Issuance of common stock upon exercise of stock awards (in shares)	162,000	456,000
Issuance of treasury shares as consideration for acquisition	$ 9,035		$ 12,316			(3,281)
Issuance of treasury shares as consideration for acquisition (in shares)			1,092,000
Excess tax benefit derived from stock award exercises	(147)			(147)
Stock-based compensation expense	5,352			5,352
Balance at Dec. 31, 2014	296,147	$ 6	$ (49,996)	207,429	(5,401)	144,109
Balance (in shares) at Dec. 31, 2014		61,852,000	9,021,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(32,338)					(32,338)
Total other comprehensive income	(8,592)				(8,592)
Comprehensive income (loss)	(40,930)
Issuance of common stock upon exercise of stock awards	$ 675	$ 0		675
Issuance of common stock upon exercise of stock awards (in shares)	405,000	793,000
Issuance of treasury shares as consideration for acquisition	$ 1,570		$ 2,686			(1,116)
Issuance of treasury shares as consideration for acquisition (in shares)			238,000
Acquisition of treasury shares (in shares)	763,787		764,000
Acquisition of treasury shares	$ (4,897)		$ (4,897)
Excess tax benefit derived from stock award exercises	(411)			(411)
Stock-based compensation expense	5,873			5,873
Balance at Dec. 31, 2015	$ 258,027	$ 6	$ (52,207)	$ 213,566	$ (13,993)	$ 110,655
Balance (in shares) at Dec. 31, 2015		62,645,000	9,547,000