Leases - Cash Flow and Other Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash payments for amounts included in the measurement of lease liabilities :
Operating cash outflows for operating leases	$ 12,831	$ 13,749
Operating cash outflows for finance leases	50	45
Financing cash outflows for finance leases	124	207
Right-of-use assets obtained in exchange for new operating lease liabilities	17,999	27,750
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 75	$ 144
Weighted-average remaining lease term
Finance lease	2 years 1 month 6 days	2 years 4 months 24 days
Operating lease	6 years 9 months 18 days	6 years 6 months
Weighted-average discount rate
Finance lease	10.20%	8.70%
Operating lease	7.40%	7.30%