Leases - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Finance lease cost, amortization of right-of-use assets	$ 5,200
Finance lease cost, Interest on lease liabilities	439
Operating lease cost	11,191
Short-term lease cost	3,996
Variable lease cost	1,049
Sublease income	(463)
Total net lease cost	$ 21,412
Rent expense		$ 16,800	$ 15,600
Operating lease, weighted-average remaining lease term	4 years 7 months 6 days
Finance lease, weighted-average remaining lease term	2 years 1 month 6 days
Operating lease, weighted-average discount rate (as a percent)	6.70%
Finance lease, weighted-average discount rate (as a percent)	5.30%