Leases - Position Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Assets:
Operating lease assets	$ 32,312	$ 46,647
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other Assets, Noncurrent	Other Assets, Noncurrent
Total lease assets	$ 32,312	$ 46,647
Current liabilities:
Operating lease liabilities	$ 8,305	$ 13,479
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Operating lease liabilities	Operating lease liabilities
Noncurrent liabilities:
Operating lease liabilities	$ 24,656	$ 33,396
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent
Total lease liabilities	$ 32,961	$ 46,875
Lease Costs
Operating lease cost	15,235	16,154
Short-term lease cost	1,165	2,568
Variable lease cost	512	605
Total lease cost	16,912	19,327
Other Information
Operating cash flows for operating leases	$ 15,235	16,154
Operating leases		$ 17,852
Lease Terms and Discount Rates
Weighted-average remaining lease term - operating leases	7 years 10 months 28 days	7 years 1 month 17 days
Weighted-average discount rate - operating leases	6.07%	5.97%
Undiscounted Cash Flows
2021	$ 10,030
2022	6,959
2023	4,816
2024	2,577
2025	2,254
Thereafter	15,176
Total undiscounted lease liability	41,812
Less: amount of lease payments representing interest	(8,851)
Long-term lease obligations	$ 32,961	$ 46,875