Income Taxes Unrecognized Tax Benefits Rollforward (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits	$ 13,390	$ 13,150
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	3,990	1,340
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	6,760	870
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	(320)	(475)
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	(720)	0
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations	(1,370)	(1,495)
Unrecognized Tax Benefits	$ 21,730	$ 13,390