Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Noncontrolling Interests [Member]
Balance, at Dec. 31, 2010	$ 119,701	$ 203	$ (176)	$ 95,556	$ 2,293	$ 21,143	$ 682
Balance, Shares at Dec. 31, 2010		20,256,735
Treasury Stock, Shares at Dec. 31, 2010			(44,578)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	13,339					13,509	(170)
Other comprehensive income (loss)	(4,048)				(4,047)		(1)
Dividends paid to non-controlling interests	0
Stock-based compensation, shares		0
Stock-based compensation	763	0		763
Shares issued for the Employee Stock Purchase Plan, shares		10,167
Shares issued for the Employee Stock Purchase Plan	58			58
Treasury stock purchased, shares			(471,554)
Treasury stock purchased	(2,552)		(2,552)
Options exercised, net of forfeiture, shares		294,426
Options exercised, net of forfeitures	651	3		648
Initial public offering costs	(826)			(826)
Balance, at Dec. 31, 2011	127,086	206	(2,728)	96,199	(1,754)	34,652	511
Balance, Shares at Dec. 31, 2011	20,561,328
Treasury Stock, Shares at Dec. 31, 2011			(516,132)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	15,237					15,165	72
Other comprehensive income (loss)	1,127				1,123		4
Dividends paid to non-controlling interests	0
Stock-based compensation, shares		87,011
Stock-based compensation	1,044	1		1,043
Stock Issued During Period Period, Shares, Direct Stock Awards		6,020
Stock Issued During Period, Shares, Direct Stock Awards	49			49
Shares issued for the Employee Stock Purchase Plan, shares		53,511
Shares issued for the Employee Stock Purchase Plan	330			330
Treasury stock purchased, shares	(508,080)		(508,080)
Treasury stock purchased	(3,923)		(3,923)
Options exercised, net of forfeiture, shares		2,500
Options exercised, net of forfeitures	20	0		20
Non-controlling interest attributable to ProtectCELL acquisition	4,745						4,745
Balance, at Dec. 31, 2012	145,715	207	(6,651)	97,641	(631)	49,817	5,332
Balance, Shares at Dec. 31, 2012	20,710,370	20,710,370
Treasury Stock, Shares at Dec. 31, 2012	(1,024,212)		(1,024,212)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,197					22,715	1,482
Other comprehensive income (loss)	(3,052)				(3,034)		(18)
Dividends paid to non-controlling interests	(43)						(43)
Distributions to non-controlling interest partners	(720)						(720)
Stock-based compensation, shares		130,784
Stock-based compensation	1,330	1		1,329
Stock Issued During Period Period, Shares, Direct Stock Awards		4,113
Stock Issued During Period, Shares, Direct Stock Awards	31	0		31
Shares issued for the Employee Stock Purchase Plan, shares		61,336
Shares issued for the Employee Stock Purchase Plan	358	1		357
Treasury stock purchased, shares	(200,000)		(199,970)
Treasury stock purchased	(1,372)		(1,363)
Stock Issued During Period, Value, Treasury Stock Reissued				(9)
Options exercised, net of forfeiture, shares		6,250
Options exercised, net of forfeitures	49	0		49
Balance, at Dec. 31, 2013	$ 166,493	$ 209	$ (8,014)	$ 99,398	$ (3,665)	$ 72,532	$ 6,033
Balance, Shares at Dec. 31, 2013	20,912,853	20,912,853
Treasury Stock, Shares at Dec. 31, 2013	(1,224,182)		(1,224,182)