Leases - Lease Balances within the Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets:
Operating lease right-of-use assets	$ 17,726	$ 19,522
Liabilities:
Lease liability location within the Consolidated Balance Sheets	Other Accrued Liabilities, Current	Other Accrued Liabilities, Current
Other accrued liabilities	$ 4,979	$ 6,094
Long-term operating lease obligations	11,948	13,681
Total lease liabilities	$ 16,927	$ 19,775