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Other Assets - Share of equity income from investments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Other Assets [Abstract]        
Share of equity income from investments $ 44,311 $ 23,359 $ 73,063 $ 35,239
Dividends received $ 121,024 $ 29,405 $ 158,942 $ 57,402