Leases - Supplemental Cash flow Information to operating leases (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Supplemental cash flow information
Cash paid for amounts included in the measurement of operating lease liabilities	$ 6,506	$ 6,356
Operating ROU assets obtained in exchange for lease liabilities	2,254	$ 855
Supplemental balance sheet information
Operating lease ROU assets	37,056		$ 40,049
Operating lease liabilities:
Accrued expenses and other current liabilities	7,961		7,079
Operating lease liabilities	30,182		34,242
Total operating lease liabilities	$ 38,143		$ 41,321