Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Significant differences between the U.S. federal statutory tax rate and Company's effective income tax expense for earnings
Statutory federal income tax rate									$ 2,274	$ 1,397	$ 1,746
State income taxes, net of federal effect									24	(130)	577
Change in deferred tax asset valuation allowance									(1,883)	(1,910)	(3,254)
Foreign taxes in excess of U.S. statutory rate									486	1,481	2,407
Compensation deduction limitation									265	360	448
Other, net									131	94	(42)
Total	$ (289)	$ 505	$ 584	$ 497	$ (1,206)	$ 593	$ 784	$ 1,121	$ 1,297	$ 1,292	$ 1,882