Income Taxes (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Mar. 17, 2006
Income Taxes (Textual) [Abstract]
Federal statutory tax rate	34.00%
Valuation allowance	$ 48,489,000	$ 51,630,000
Decrease in valuation allowance	3,100,000
Undistributed earnings of international subsidiaries	4,300,000	4,800,000
Additional deferred taxes	(799,000)	(2,151,000)	(1,354,000)
Increase in annual usage limitation				17,800,000
Annual usage limitation				1,400,000
Unrecognized tax benefits	2,200,000	2,600,000
Decrease in unrecognized tax benefits	400,000
Accrued interest and penalties	1,400,000	2,200,000
Decrease in accrued interest and penalties	800,000
Reduction of interest expense	800,000
Interest expense		400,000
Effective tax rate on earnings reported	19.40%	31.50%	36.70%
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Federal loss carry-forwards available	78,600,000			78,600,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Federal loss carry-forwards available	$ 91,300,000