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

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.