Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]		Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2014	21,843
Balance at Dec. 31, 2014	$ 22		$ 355,906	$ (122,387)	$ (85,352)	$ (1,566)	$ 146,623
Net income					1,670		1,670
Change in accumulated other comprehensive income						756	756
Purchase of treasury stock (in shares)	(1,090)
Purchase of treasury stock	$ (1)			(11,259)			(11,260)
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan (in shares)	233
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan				2,269	(500)		1,769
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and restricted stock units by employees and directors (in shares)	705
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and restricted stock units by employees and directors	$ 1		26	6,855	(5,744)		1,138
Equity-based compensation			3,925				3,925
Balance (in shares) at Sep. 30, 2015	21,693
Balance at Sep. 30, 2015	$ 22		359,857	(124,522)	(89,926)	(810)	144,621
Balance (in shares) at Jun. 30, 2015	21,995
Balance at Jun. 30, 2015	$ 22		358,596	(121,929)	(88,677)	(930)	147,082
Net income					167		167
Change in accumulated other comprehensive income						120	120
Purchase of treasury stock (in shares)	(540)
Purchase of treasury stock				(4,912)			(4,912)
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan (in shares)	117
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan				1,141	(238)		903
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and restricted stock units by employees and directors (in shares)	121
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and restricted stock units by employees and directors				1,178	(1,178)
Equity-based compensation			1,261				1,261
Balance (in shares) at Sep. 30, 2015	21,693
Balance at Sep. 30, 2015	$ 22		359,857	(124,522)	(89,926)	(810)	144,621
Balance (in shares) at Dec. 31, 2015	21,573
Balance at Dec. 31, 2015	$ 22		361,023	(125,697)	(90,763)	(1,267)	143,318
Net income					3,501		3,501
Change in accumulated other comprehensive income						567	$ 567
Purchase of treasury stock (in shares)	(623)						(623,000)
Purchase of treasury stock	$ (1)	[1]		(6,081)			$ (6,081)
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan (in shares)	233
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan			9	2,270	(493)		1,786
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and restricted stock units by employees and directors (in shares)	826
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and restricted stock units by employees and directors	$ 1	[1]		8,032	(6,845)		1,188
Equity-based compensation			3,705				3,705
Balance (in shares) at Sep. 30, 2016	22,009
Balance at Sep. 30, 2016	$ 22		364,737	(121,476)	(94,600)	(700)	147,983
Balance (in shares) at Jun. 30, 2016	21,743
Balance at Jun. 30, 2016	$ 22		363,267	(123,749)	(96,676)	(474)	142,390
Net income					5,334		5,334
Change in accumulated other comprehensive income						(226)	(226)
Purchase of treasury stock (in shares)	(215)
Purchase of treasury stock				(2,405)			(2,405)
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan (in shares)	119
Issuance of treasury stock upon purchase of common stock under employee stock purchase plan				1,156	(258)		898
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and restricted stock units by employees and directors (in shares)	362
Issuance of treasury stock upon exercise of stock options, stock appreciation rights and restricted stock units by employees and directors			9	3,522	(3,000)		531
Equity-based compensation			1,461				1,461
Balance (in shares) at Sep. 30, 2016	22,009
Balance at Sep. 30, 2016	$ 22		$ 364,737	$ (121,476)	$ (94,600)	$ (700)	$ 147,983

[1] Represents an amount lower than $1.