Income Taxes (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes (Textual) [Abstract]
Undistributed earnings of foreign subsidiaries	$ 161,942,000	$ 139,857,000
Tax loss carryforwards	6,753,000	9,087,000
Expiration of Tax loss carryforwards, 2013	301,000
Expiration of Tax loss carryforwards, 2014	381,000
Expiration of Tax loss carryforwards, 2015	1,573,000
Expiration of Tax loss carryforwards, 2016	3,699,000
Expiration of Tax loss carryforwards, 2017	125,000
Expiration of Tax loss carryforwards, 2018	104,000
Expiration of Tax loss carryforwards, 2019	62,000
Expiration of Tax loss carryforwards, 2020	128,000
Expiration of Tax loss carryforwards, 2021	380,000
Tax credit carryforwards	532,000	31,000
Expiration of Tax credit carryforwards, 2013	16,000
Expiration of Tax credit carryforwards, 2016	351,000
Expiration of Tax credit carryforwards, 2017	165,000
Valuation Allowance	(603,000)	(742,000)
Unrecognized tax benefits	289,000	1,232,000	1,902,000	2,052,000
Unrecognized tax benefits that, if recognized, would impact effective tax rates	275,000	1,023,000	1,720,000
Recognition of interest and penalties accrued related to unrecognized tax benefits as income tax expense	444,000	2,000	(26,000)
Income tax liability for interest and penalties	41,000	486,000
Net tax benefit recognized under voluntary disclosure agreement	$ 688,000