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Derivative Instruments, Hedging Activities and Fair Value (Details 4) (USD $)
In Thousands
Sep. 30, 2011
Cross-Currency Interest Rate Swaps Maturing 2018
 
Derivatives Designated as Hedging Instruments 
Contractual Amount$ 250,000
Cross-Currency Interest Rate Swaps Maturing 2020
 
Derivatives Designated as Hedging Instruments 
Contractual Amount220,000
Cross-Currency Interest Rate Swaps Maturing 2013
 
Derivatives Designated as Hedging Instruments 
Contractual Amount$ 1,800