Leases - Supplemental Balance sheet information (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Supplemental balance sheet information related to leases
Operating lease - right of use asset	$ 21,555	$ 22,557
Other current liabilities	3,770	3,822
Operating lease liabilities	18,010	18,981
Total operating lease liabilities	$ 21,780	$ 22,803
Weighted Average Remaining Lease Term - Operating leases	75 months	78 months
Weighted Average Discount Rate - Operating leases	5.31%	5.32%