Leases - Components of Leases and Lease Costs (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Operating leases
Operating lease right-of-use assets	$ 50,414	$ 39,269
Accrued liabilities	16,407	14,249
Operating lease liabilities	37,973	28,516
Total operating lease liabilities	$ 54,380	$ 42,765
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent