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Related Party Transactions (Related Party Revenue) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Related party transactions:    
Management fee revenue $ 7,156 $ 7,416
Revenue from related parties 7,156 7,416
Blackwater [Member]    
Related party transactions:    
Management fee revenue 6,249 6,200
Mercury [Member]    
Related party transactions:    
Management fee revenue $ 907 $ 1,216