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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017
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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

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