Leases - Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease right-of-use assets, net of amortization	$ 15,193	$ 18,874
Financing lease right-of-use assets, net of amortization	12,135	12,858
Total assets	27,328	31,732
Current portion of operating lease liabilities	3,970	4,989
Current portion of financing lease liabilities	1,408	3,901
Total current	5,378	8,890
Operating lease liabilities	12,033	14,537
Financing lease liabilities	10,324	8,376
Total noncurrent	22,357	22,913
Total liabilities	27,735	31,803
Operating lease, right-of-use asset, accumulated amortization	8,900	9,000
Finance lease, right-of-use asset, accumulated amortization	$ 2,100	$ 6,400