Summary of Significant Accounting Policies - Leases - Assets and Liabilities (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Components of lease assets and liabilities
Operating lease right-of-use assets	$ 23,545
Operating Lease, Right-of-Use Asset, Statement of Financial Position	us-gaap:OtherAssetsNoncurrent
Current operating lease liabilities	$ 14,526
Operating Lease, Liability, Current, Statement of Financial Position	us-gaap:AccruedLiabilitiesCurrent
Long-term operating lease liabilities	$ 24,923
Operating Lease, Liability, Noncurrent, Statement of Financial Position	us-gaap:DeferredCreditsAndOtherLiabilitiesNoncurrent
Total operating lease liabilities	$ 39,449
Operating Lease, Liability, Statement of Financial Position	us-gaap:AccruedLiabilitiesCurrent us-gaap:DeferredCreditsAndOtherLiabilitiesNoncurrent
Finance lease assets	$ 11,892
Finance Lease, Right-of-Use Asset, Statement of Financial Position	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Current finance lease liabilities	$ 4,460
Finance Lease, Liability, Current, Statement of Financial Position	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Long-term finance lease liabilities	$ 11,967
Finance Lease, Liability, Noncurrent, Statement of Financial Position	us-gaap:LongTermDebtAndCapitalLeaseObligations
Total finance lease liabilities	$ 16,427
Total lease liabilities	$ 55,876