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Other Assets - Share of equity income from investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Other Assets [Abstract]        
Share of equity income from investments $ 95,169 $ 85,120 $ 168,232 $ 120,359
Dividends received $ 82,755 $ 49,865 $ 241,697 $ 107,267