Income Taxes Unrecognized Tax Benefits Narrative (Details) (USD $)				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 Maximum [Member]	Dec. 31, 2012 Foreign Tax Authority [Member] number
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 21,730,000	$ 13,390,000	$ 13,150,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	14,000,000	9,300,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 1,600,000	$ 1,800,000
Open Tax Year				2012	2002
Income Tax Examinations, Number						1