Income Taxes (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Pre-tax income from U.S. jurisdiction	$ 16,900,000	$ 28,000,000
Pre-tax income from foreign jurisdictions	2,300,000	300,000
Deferred Tax Assets, Net, Current	22,300,000
Deferred Tax Assets, Valuation Allowance	8,999,000	7,625,000
Liability for Uncertain Tax Positions, Current	12,500,000
Federal Effects of Potential State Tax Exposures Reduced in Net Liability	9,400,000
Tax Provision Included Not Yet Reduced Income Tax Payments	3,700,000
Anticipate Significant Change to Uncertain Income Tax within Next Twelve Months	5,700,000
Accrued Income Taxes, Noncurrent	3,575,000	2,759,000
Accrued Income Taxes, Current	100,000
Unrecognized Tax Benefits, Recognized in Current Period from Lapse of Statute of Limitations	1,100,000
Income Tax Examination, Interest Accrued	300,000	400,000
Undistributed Earnings of Foreign Subsidiaries	7,500,000	5,300,000
State and Local Jurisdiction [Member]
Deferred Tax Assets, Tax Credit Carryforwards, Research	22,200,000
Deferred tax Assets, Tax Carryforwards, Research, Pre-Ownership Change	2,300,000
Current Income Taxes Payable [Member]
Income Tax Examination, Interest Accrued	55,000
Long-Term Income Taxes Payable [Member]
Income Tax Examination, Interest Accrued	$ 300,000