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Leases (Operating Lease Cost) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases [Abstract]    
Operating lease cost $ 2,242 $ 3,458
Short term lease cost 27 50
Variable lease cost 15,696 32,295
Sublease income (860) (1,774)
Total net lease cost $ 17,105 $ 34,029