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Financial Instruments (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2011
Sep. 30, 2010
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Number of interest rate swap agreements   2      
Ineffectiveness in cash flow hedges $ 0   $ 0 $ 0 $ 0
Derivative losses included in AOCI       $ 3,700,000  
Cross Currency Swap [Member]
         
Derivative instrument maturity period (years)       10  
Forward Currency Contracts [Member]
         
Number of multiple forward currency contracts matured       6