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Income Taxes (Details Textual) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Income Taxes (Additional Textual) [Abstract] |  |  |  |  |
Current net deferred tax assets |  | $ 100,000 | $ 0 |  |
Long-term net deferred tax assets |  | 1,400,000 | 100,000 |  |
Current net deferred tax liabilities |  | 400,000 | 400,000 |  |
Long-term net deferred tax liabilities |  | 361,000 | 8,646,000 |  |
Valuation allowance |  | 2,100,000 | 3,100,000 |  |
Operating loss carryforwards, expiration date |  | 2019 through 2028 |  |  |
Operating loss carryforwards relate to a prior acquisition |  | 5,700,000 |  |  |
Deferred income tax benefit | 5,500,000 |  |  |  |
U.S. federal and state capital loss carryforwards |  | 1,900,000 |  |  |
U.S. federal and state capital loss carry forwards expires in 2014 |  | 1,100,000 |  |  |
U.S. federal and state capital loss carry forwards expires in 2016 |  | 800,000 |  |  |
Net tax benefits (deficiencies) from tax deductions in excess of (or less than) book deductions resulting from employee stock option exercises |  | (300,000) | 500,000 | 1,800,000 |
Undistributed earnings of company's foreign subsidiaries |  | 5,200,000 |  |  |
Unrecognized tax benefits |  | 1,671,000 | 1,269,000 | 1,222,000 | 919,000
Accrued interest and penalties related to uncertain tax positions |  | 100,000 | 200,000 |  |
Domestic tax authority [Member] |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |
Operating loss carryforwards |  | 10,000,000 |  |  |
Foreign tax authority [Member] |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |
Operating loss carryforwards |  | $ 19,800,000 |  |  |

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