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Long-term Debt (Maturities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Less than one year $ 538,384 $ 311,339
Due after one year and through three years 1,550,581 627,444
Due after three years and through five years 1,646,101 1,761,465
Due after five years 11,138,129 6,348,580
Total debt obligations $ 14,873,195 $ 9,048,828