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Accounting for Derivatives (Details) (USD $)
 1 Months Ended 12 Months Ended 3 Months Ended
Nov. 30, 2010
Dec. 31, 2012
country
Dec. 31, 2010
Designated as a hedging instrument
Interest rate hedges
Dec. 31, 2012
Designated as a hedging instrument
Interest rate hedges
Dec. 31, 2011
Designated as a hedging instrument
Interest rate hedges
Dec. 31, 2012
Designated as a hedging instrument
Interest rate hedges
Accrued liabilities
Dec. 31, 2011
Designated as a hedging instrument
Interest rate hedges
Accrued liabilities
Dec. 31, 2012
Designated as a hedging instrument
Interest rate hedges
Other long-term liabilities
Dec. 31, 2011
Designated as a hedging instrument
Interest rate hedges
Other long-term liabilities
Dec. 31, 2010
Terminated hedge
Interest rate hedges
Dec. 31, 2012
Terminated hedge
Interest rate hedges
Accounting for Derivatives                      
Number of countries in which the company operates   30                  
Fair Value Asset (Liability)                      
Notional amount of interest rate swaps       $ 250,000,000           $ 585,000,000  
Weighted average effective fixed interest rate on interest rate swaps (as a percent)       1.80%           4.60%  
Interest expense on the ineffectiveness of interest rate swaps     200,000                
Deferred pre-tax loss to be reclassified during next 12 months       3,900,000             1,600,000
Amount of interest rate swap termination payments 14,800,000                 43,000,000  
Derivatives liability designated as hedging instruments, Fair value       $ (9,916,000) $ (19,446,000) $ (3,873,000) $ (14,250,000) $ (6,043,000) $ (5,196,000)