Leases - Supplemental Cash flow Information to operating leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Supplemental cash flow information
Cash paid for amounts included in the measurement of operating lease liabilities	$ 2,143	$ 2,118
Operating ROU assets obtained in exchange for lease liabilities	0	$ 388
Supplemental balance sheet information
Operating lease right-of-use assets	38,329		$ 40,049
Operating lease liabilities:
Accrued expenses and other current liabilities	7,111		7,079
Operating lease liabilities	32,440		34,242
Total operating lease liabilities	$ 39,551		$ 41,321