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Long-term Debt - Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Less than one year $ 429,664 $ 311,339
Due after one year and through three years 1,333,487 627,444
Due after three years and through five years 1,448,258 1,761,465
Due after five years 8,623,554 6,348,580
Total $ 11,834,963 $ 9,048,828