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Income Taxes (Details 2) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Gross Deferred Income Tax Assets: |  |  |
Excess of provision for bad debts over charge-offs | $ 4,573,000 | $ 4,744,000 |
Net operating loss | 675,000 | 66,000 |
Accrued compensation expenses recognized for financial reporting purposes, not currently deductible for tax purposes | 14,909,000 | 20,099,000 |
Accrued expenses | 2,069,000 | 1,680,000 |
Unrealized derivative losses | 316,000 |  |
Customer deposits | 7,545,000 | 6,154,000 |
Unrealized foreign exchange | 914,000 | 906,000 |
Total gross deferred income tax assets | 31,001,000 | 33,649,000 |
Deferred income tax assets, net of valuation allowance | 31,001,000 | 33,649,000 |
Gross Deferred Income Tax Liabilities: |  |  |
Excess of tax over financial reporting for depreciation of fixed assets | (11,999,000) | (4,650,000) |
Excess of tax over financial reporting amortization of identifiable intangible assets and goodwill | (23,108,000) | (15,772,000) |
Prepaid expenses deductible for tax purposes | (1,719,000) | (1,204,000) |
Unrealized derivative gains |  | (5,572,000) |
Other | (1,330,000) | (834,000) |
Gross deferred income tax liabilities | (38,156,000) | (28,032,000) |
Net deferred income tax (liabilities) assets | (7,155,000) | 5,617,000 |
Report on the consolidated balance sheets as: |  |  |
Other current assets for deferred income tax assets, current | 15,282,000 | 13,238,000 |
Non-current other assets for deferred income tax assets, non-current | 5,406,000 | 2,661,000 |
Accrued expenses and other current liabilities for deferred income tax liabilities, current | 6,084,000 | 1,009,000 |
Non-current inocme tax liabilities, net for deferred income tax liabilities, non-current | 21,759,000 | 9,273,000 |
Foreign net operating losses | 2,800,000 | 200,000 |
Annual capital in excess of par value pool of windfall income tax benefits related to employee compensation | 3,700,000 | 6,000,000 | 10,400,000
Decrease in foreign income taxes due to special income tax concession in Singapore | $ 5,500,000 | $ 8,400,000 | $ 7,800,000
Impact of income tax concession on diluted earnings per common share (in dollars per share) | $ 0.08 | $ 0.12 | $ 0.12
Period applicable for new income tax concession | 5 years |  |

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