Leases - Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets and liabilities
Operating lease assets	$ 43,260	$ 46,604
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Operating lease assets	Operating lease assets
Operating lease liabilities, current	$ 9,867	$ 7,762
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other Accrued Liabilities, Current	Other Accrued Liabilities, Current
Operating lease liabilities	$ 47,220	$ 47,725
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Operating lease liabilities	Operating lease liabilities
Total operating lease liabilities	$ 57,087	$ 55,487