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Income Taxes Reconciliation of the change in unrecognized tax benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, beginning of period	$ 171,863	$ 258,016	$ 326,088
Decreases related to tax positions taken during the current period	0	0	0
Increases related to tax positions taken during a prior period	8,782	2,699	55,385
Decreases related to tax positions taken during a prior period	(9,373)	(79,719)	(14,025)
Increases related to tax positions taken during the current period	11,797	1,620	1,441
Decreases related to settlements with taxing authorities	0	0	(94,779)
Reductions as a result of a lapse of the statute of limitations	(12,644)	(10,753)	(16,094)
Unrecognized Tax Benefits, end of period	$ 170,425	$ 171,863	$ 258,016

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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The gross amount of decreases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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