Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]	Scenario, Previously Reported [Member]	Scenario, Previously Reported [Member] Common Stock [Member]	Scenario, Previously Reported [Member] Treasury Stock [Member]	Scenario, Previously Reported [Member] Additional Paid-in Capital [Member]	Scenario, Previously Reported [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Scenario, Previously Reported [Member] Retained Earnings [Member]	Scenario, Previously Reported [Member] Noncontrolling Interest [Member]	Scenario, Actual [Member]	Scenario, Actual [Member] Common Stock [Member]	Scenario, Actual [Member] Treasury Stock [Member]	Scenario, Actual [Member] Additional Paid-in Capital [Member]	Scenario, Actual [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Scenario, Actual [Member] Retained Earnings [Member]	Scenario, Actual [Member] Noncontrolling Interest [Member]
Treasury Stock, Shares at Dec. 31, 2010
Common Stock, Shares at Dec. 31, 2010
Total stockholders' equity	$ 127,584							$ 132,277	$ 206	$ (2,728)	$ 96,199	$ (1,754)	$ 39,822	$ 532	$ 127,584	$ 206	$ (2,728)	$ 96,199	$ (1,754)	$ 35,150	$ 511
Cumulative effect of adjustment resulting from new accounting guidance								(4,693)					(4,672)	(21)
Total stockholders' equity at Dec. 31, 2011	127,584							132,277	206	(2,728)	96,199	(1,754)	39,822	532	127,584	206	(2,728)	96,199	(1,754)	35,150	511
Common Stock, Shares at Dec. 31, 2011	20,561,328								20,561,328							20,561,328
Treasury Stock, Shares at Dec. 31, 2011	(516,132)									516,132							(516,132)
Total stockholders' equity	137,283	207	(6,651)	97,095	(673)	46,725	580
Net income	11,637					11,575	62
Other comprehensive income	1,088				1,081		7
Stock-based compensation, shares		90,519
Stock-based compensation	711	1		710
Shares issued for the Employee Stock Purchase Plan, shares	29,405
Shares issued for the Employee Stock Purchase Plan	167			167
Treasury stock purchased, shares			(508,080)
Treasury stock purchased	(3,923)		(3,923)
Stock Issued During Period, Value, Stock Options Exercised	19			19
Total stockholders' equity at Sep. 30, 2012	$ 137,283	$ 207	$ (6,651)	$ 97,095	$ (673)	$ 46,725	$ 580
Common Stock, Shares at Sep. 30, 2012	20,681,252	20,681,252
Treasury Stock, Shares at Sep. 30, 2012	(1,024,212)		1,024,212