Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Period over which gains and losses are reclassified to earnings, low end of range	10 years
Period over which gains and losses are reclassified to earnings, high end of range	15 years
Asset Derivatives - Fair Value		$ 44,910
Liability Derivatives - Fair Value		1,792
Derivatives designated as hedging instruments | Foreign currency forward exchange contracts | Other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives - Fair Value		274
Derivatives designated as hedging instruments | Foreign currency forward exchange contracts | Other current liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives - Fair Value		0
Derivatives designated as hedging instruments | Cross currency interest rate swaps | Other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives - Fair Value	39,058	44,636
Derivatives designated as hedging instruments | Cross currency interest rate swaps | Other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives - Fair Value	14,346	1,792
Derivatives not designated as hedging instruments | Foreign currency forward exchange contracts | Other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives - Fair Value	853	2,912
Derivatives not designated as hedging instruments | Foreign currency forward exchange contracts | Other current liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives - Fair Value	$ 1,775	$ 1,207