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Income Taxes, income taxes receivable (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Income taxes receivable	$ 85,636	$ 64,985
Federal
Income Tax Disclosure [Abstract]
Income taxes receivable	77,238	56,109
State
Income Tax Disclosure [Abstract]
Income taxes receivable	$ 8,398	$ 8,876

Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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