Derivative Financial Instruments Effect of Net Investment Hedge Nonderivative Financial Instrument on OCI (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Gain (loss) recognized in OCI on derivative, (Effective Portion) [Abstract]
Before tax	$ (2,343)	$ 20,943	$ (14,923)	$ 39,498
After tax	$ (1,452)	$ 12,908	$ (9,262)	$ 24,352