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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Supplemental Cash Flow Information [Abstract]      
Cumulative-effect adjustment from adoption of accounting guidance $ 997   $ 0
Non-cash financing activities:      
Dividends declared but not paid 4,729 $ 3,893 3,167
Member distributions declared but not paid $ 4,618 $ 11,837 $ 4,598