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Other Assets - Related party transactions (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]        
Revenues $ 12,170 $ 14,054 $ 40,400 $ 39,987
Expenses $ 1,735 $ 3,770 $ 8,643 $ 11,503