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Income Taxes (Detail Textuals) (USD $)	12 Months Ended
Income Taxes (Detail Textuals) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Loss Carryforwards [Line Items]
Undistributed earnings of the Company's foreign subsidiaries	$ 9,500,000
Total net income tax payments (refunds)	158,700,000	90,729,000	61,632,000
Unrecognized tax benefits	38,000	35,000
Bonus depreciation allowance	50.00%
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards related to state income taxes	27,200,000
Valuation allowance	$ 1,000,000

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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- Definition

The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns.

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