Derivative Financial Instruments Activity of Hedging Instruments in Accumulated OCI (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net unrealized loss on hedging instruments at January 1,			$ (10,034)	$ (30,300)
Unrealized gain (loss) on derivative instruments	(224)	(517)	(164)	(2,542)
Unrealized gain (loss) on a nonderivative net investment hedging instrument	(1,452)	12,908	(9,262)	24,352
Realized (gains) losses reclassified into net income (loss)	(1,332)	(1,995)	2,774	4,197
Net unrealized loss on hedging instruments at June 30	$ (16,686)	$ (4,293)	$ (16,686)	$ (4,293)