Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets:
Operating lease assets	$ 130,717	$ 139,385
Liabilities
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent
Current portion of operating lease liabilities	$ 13,078	12,728
Operating lease liabilities, less current portion	141,925	151,226
Total operating lease liabilities	$ 155,003	$ 163,954