Supplemental balance sheet information related to leases (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019
Operating lease right-of-use assets	$ 37,576	$ 39,256	$ 34,472
Current portion of operating lease liabilities	9,914	9,823	8,938
Long-term operating lease liabilities	24,040	25,893	23,098
Total operating lease liabilities	$ 33,954	$ 35,716	$ 32,036