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Income Taxes, income taxes receivable (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Income taxes receivable	$ 9,625	$ 85,636
Federal
Income Tax Disclosure [Abstract]
Income taxes receivable		77,238
Income taxes (payable)	(5,455)
State
Income Tax Disclosure [Abstract]
Income taxes receivable	$ 9,625	$ 8,398

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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- Definition

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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