Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases
Operating lease cost	$ 6,263	$ 6,127
Short-term lease cost	1,602	1,237
Variable lease cost	1,466	1,625
Total lease cost	9,331	8,989
Cash paid for amounts included in the measurement of lease liability operating cash flows	1,587	1,560
ROU assets obtained in exchange for lease liabilities	$ 329	$ 585
Weighted-average remaining lease term (in years)	19 years 3 months 29 days	20 years
Weighted-average discount rate	6.90%	6.91%