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Income Taxes (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Taxes [Abstract]
Income tax provision	$ 50,031,000	$ 34,455,000
Effective income tax rate, percent	35.70%	35.60%
Effective income tax rate, at federal statutory income tax rate, percent	35.00%	35.00%
Cash paid for taxes, net of refunds received	$ 1,700,000	$ 4,100,000

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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