Financial Derivative Instruments (Details 3) (USD $) In Thousands, unless otherwise specified			3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Cash Flow Hedging Foreign currency derivatives	Sep. 30, 2013 Cash Flow Hedging Foreign currency derivatives	Sep. 30, 2013 Cash Flow Hedging Interest rate derivatives	Sep. 30, 2013 Cash Flow Hedging Interest rate derivatives
Gains (losses) for designated hedge contracts
(Gain) loss recognized in AOCI on derivatives (effective portion)			$ 3,960	$ (10,204)	$ 82	$ (929)
(Gain) loss reclassified from AOCI into income (effective portion)			(3,005)	(6,395)	217	440
(Gain) loss recognized in nonoperating (income) expense (ineffective portion)				(61)
Amount of collateral posted with counterparties	$ 0	$ 0