Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financial assets and liabilities carried at fair value and measured at fair value on a recurring basis:
Interest rate swap liabilities	$ 5,335	$ 8,766
Contingent Value Rights Liability
Financial assets and liabilities carried at fair value and measured at fair value on a recurring basis:
Common stock warrant liability		656
Recurring basis | Significant Observable Inputs (Level 2)
Financial assets and liabilities carried at fair value and measured at fair value on a recurring basis:
Interest rate swap assets	156
Interest rate swap liabilities	5,335	8,766
Recurring basis | Level 3 | Warrant Liability
Financial assets and liabilities carried at fair value and measured at fair value on a recurring basis:
Common stock warrant liability		8,790
Recurring basis | Level 3 | Contingent Value Rights Liability
Financial assets and liabilities carried at fair value and measured at fair value on a recurring basis:
Common stock warrant liability		656
Carrying Value
Financial assets and liabilities carried at fair value and measured at fair value on a recurring basis:
Contingent value rights liability	171,273	160,655
Estimated Fair Value
Financial assets and liabilities carried at fair value and measured at fair value on a recurring basis:
Contingent value rights liability	$ 174,254	$ 163,906