Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets:
Investment in equity securities	$ 91,183
Total assets	91,183
Liabilities:
Liabilities measured at fair value	23,848	$ 36,637
Level 1
Assets:
Investment in equity securities	91,183
Total assets	91,183
Level 2
Liabilities:
Liabilities measured at fair value	23,848	36,637
Interest Rate Swap Agreements | Derivatives Designated as Effective Hedging Instruments
Liabilities:
Liabilities measured at fair value	13,266	20,377
Interest Rate Swap Agreements | Derivatives Designated as Effective Hedging Instruments | Level 2
Liabilities:
Liabilities measured at fair value	13,266	20,377
Interest Rate Swap Agreements | Derivatives Not Designated as Hedging Instruments
Liabilities:
Liabilities measured at fair value	10,582	16,260
Interest Rate Swap Agreements | Derivatives Not Designated as Hedging Instruments | Level 2
Liabilities:
Liabilities measured at fair value	$ 10,582	$ 16,260