Leases - Supplemental Balance sheet information (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Supplemental balance sheet information related to leases
Operating lease - right of use asset	$ 22,460		$ 22,557
Other current liabilities	4,085		3,822
Operating lease liabilities	18,638		18,981
Total operating lease liabilities	$ 22,723		$ 22,803
Weighted Average Remaining Lease Term - Operating leases		72 months	78 months
Weighted Average Discount Rate - Operating leases	5.18%		5.32%