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Fair Value Measurements and Derivative Instruments - Income Statement Hedging Instruments (Details) - Fair Value Hedging - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Effect of derivative instruments involved in hedging on the consolidated financial statements    
Amount of Gain (Loss) Recognized in Income on Derivative $ 28,630 $ 18,128
Amount of Gain (Loss) Recognized in Income on Hedged Item (19,775) (8,459)
Interest rate swaps | Interest expense, net of interest capitalized    
Effect of derivative instruments involved in hedging on the consolidated financial statements    
Amount of Gain (Loss) Recognized in Income on Derivative 2,362 2,976
Amount of Gain (Loss) Recognized in Income on Hedged Item 3,925 3,882
Interest rate swaps | Other income (expense)    
Effect of derivative instruments involved in hedging on the consolidated financial statements    
Amount of Gain (Loss) Recognized in Income on Derivative 26,268 15,152
Amount of Gain (Loss) Recognized in Income on Hedged Item $ (23,700) $ (12,341)