Derivative Financial Instruments Activity of Hedging Instruments in Accumulated OCI (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Net unrealized loss on hedging instruments at beginning			$ (10,034)	$ (30,300)
Unrealized gain (loss) on derivative instruments	2,086	(378)	1,922	(2,920)
Unrealized gain (loss) on a nonderivative net investment hedging instrument	408	(12,149)	(8,854)	12,203
Realized (gains) losses reclassified into net income (loss)	176	(1,677)	(2,598)	(5,874)
Net unrealized loss on hedging instruments at end	$ (14,368)	$ (15,143)	$ (14,368)	$ (15,143)