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Leases - (Supplemental Cash Flow Information) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from finance leases $ 10 $ 22
Operating cash flows from operating leases 7,170 14,383
Financing cash flows from finance leases 138 281
Supplemental non-cash information on lease liabilities arising from right-of-use assets:    
Right-of-use assets obtained in exchange for new finance lease liabilities 0 0
Right-of-use assets obtained in exchange for new operating lease liabilities $ 2,318 $ 4,946