Derivative Financial Instruments Effect of Net Investment Hedge Nonderivative Financial Instrument on OCI (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Gain (loss) recognized in OCI on derivative, (Effective Portion) [Abstract]
Before tax	$ 645	$ (19,703)	$ (14,278)	$ 19,795
After tax	$ 408	$ (12,149)	$ (8,854)	$ 12,203