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Investments Equity Method Investments Table (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Investments [Abstract]    
Income on equity investments, net, before amortization of basis difference $ 58,154 $ 51,606
Amortization of basis difference (12,469) (12,469)
Income on equity investments, net $ 45,685 $ 39,137