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Fair Value Measurements (Details 5) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Effect of Derivative Instruments on the Consolidated Statements of Income and Comprehensive Income    
Unrealized amount of (Loss) Gain Recognized in Income on Derivative $ 181 $ 89
Interest rate contracts
   
Effect of Derivative Instruments on the Consolidated Statements of Income and Comprehensive Income    
Unrealized amount of (Loss) Gain Recognized in Income on Derivative 388 390
Interest expense, including the change in the fair value of non-hedged derivative instruments | Interest rate contracts | Derivatives Not Designated as Hedging Instruments
   
Effect of Derivative Instruments on the Consolidated Statements of Income and Comprehensive Income    
Unrealized amount of (Loss) Gain Recognized in Income on Derivative 388 390
Realized amount of (Loss) Gain Recognized in Income on Derivative (398) (293)
Amount of (Loss) Gain Recognized in Income on Derivative (10) 97
Cost of revenue | Fuel commodity derivatives | Derivatives Not Designated as Hedging Instruments
   
Effect of Derivative Instruments on the Consolidated Statements of Income and Comprehensive Income    
Unrealized amount of (Loss) Gain Recognized in Income on Derivative 53 250
Realized amount of (Loss) Gain Recognized in Income on Derivative   13
Amount of (Loss) Gain Recognized in Income on Derivative 53 263
Derivatives in Net Investment Hedging Relationships | Interest rate contracts
   
Effect of Derivative Instruments on the Consolidated Statements of Income and Comprehensive Income    
Unrealized amount of Loss Recognized in OCI on Derivative (Effective Portion)   (67)
Realized amount of Loss Recognized in OCI on Derivative (Effective Portion)   (162)
Amount of Loss Recognized in OCI on Derivative (Effective Portion)   (229)
Derivatives in Net Investment Hedging Relationships | Interest expense, including the change in the fair value of non-hedged derivative instruments | Interest rate contracts
   
Effect of Derivative Instruments on the Consolidated Statements of Income and Comprehensive Income    
Unrealized amount of Loss Reclassified from Accumulated OCI into Income (207) (301)
Realized amount of Loss Reclassified from Accumulated OCI into Income   (162)
Amount of Loss Reclassified from Accumulated OCI into Income $ (207) $ (463)