Income Taxes (Details 2) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Components of net deferred tax assets
Excess of provision for bad debts over charge-offs	$ 4,744,000	$ 4,400,000
Net operating loss	66,000	113,000
Excess of tax over financial reporting for depreciation of fixed assets	(4,650,000)	(2,101,000)
Excess of tax over financial reporting amortization of identifiable intangible assets and goodwill	(15,772,000)	(12,729,000)
Accrued compensation expenses recognized for financial reporting purposes, not currently deductible for tax purposes	20,099,000	17,181,000
Accrued expenses	1,680,000	6,800,000
Prepaid expenses deductible for tax purposes	(1,204,000)	(1,341,000)
Unrealized derivative gains	(5,572,000)	(743,000)
Customer deposits	6,154,000	2,489,000
Unrealized foreign exchange	906,000	(974,000)
Other	(834,000)	(1,372,000)
Gross deferred income tax assets	5,617,000	11,723,000
Total deferred income tax assets, net	5,617,000	11,723,000
Deferred income tax assets, current	13,238,000	13,492,000
Deferred income tax assets, non-current	2,661,000	5,135,000
Deferred income tax liabilities, current	1,009,000	1,068,000
Deferred income tax liabilities, non-current	9,273,000	5,836,000
Foreign net operating losses	200,000	400,000
Annual capital in excess of par value pool of windfall tax benefits related to employee compensation	6,000,000	10,400,000	3,100,000
Decrease in foreign taxes due to special tax concession in Singapore	$ 8,400,000	$ 7,800,000	$ 6,500,000
Impact of tax concession on diluted earnings per common share (in dollars per share)	$ 0.12	$ 0.12	$ 0.11

The tax effect as of the balance sheet date of the amount of the estimated future tax deductions attributable to customer deposits which can only be realized if sufficient taxable income is generated in future periods to enable the deduction to be taken.

No definition available.