Derivative Instruments, Hedging Activities and Fair Value (Details) (USD $)			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Derivatives Designated as Hedging Instruments	Mar. 31, 2013 Derivatives Designated as Hedging Instruments Cross Currency Interest Rate Contract [Member] Other assets	Dec. 31, 2012 Derivatives Designated as Hedging Instruments Cross Currency Interest Rate Contract [Member] Other assets	Mar. 31, 2013 Derivatives Designated as Hedging Instruments Cross Currency Interest Rate Contract [Member] Noncurrent liabilities	Dec. 31, 2012 Derivatives Designated as Hedging Instruments Cross Currency Interest Rate Contract [Member] Noncurrent liabilities	Mar. 31, 2013 Derivatives Not Designated as Hedging Instruments Foreign currency forward exchange contracts Other current assets	Dec. 31, 2012 Derivatives Not Designated as Hedging Instruments Foreign currency forward exchange contracts Other current assets	Mar. 31, 2013 Derivatives Not Designated as Hedging Instruments Foreign currency forward exchange contracts Other current liabilities	Dec. 31, 2012 Derivatives Not Designated as Hedging Instruments Foreign currency forward exchange contracts Other current liabilities
Derivative contracts
Derivatives Subject to Master Netting Arrangements	$ 200,000	$ 100,000
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			47,947,000	47,752,000	39,058,000			2,200,000	853,000
Liability Derivatives			$ 199,000			$ 199,000	$ 14,346,000			$ 3,671,000	$ 1,775,000