Commitments and Contingencies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Commitments [Line Items]
Employment agreements with certain executives, minimum cash-based compensation for next fiscal year	$ 3,300,000
Initial term of non cancellable operating leases, minimum (in years)	1 year
Financing leases
2020	$ 2,619,000
2021	2,794,000
2022	2,794,000
2023	2,794,000
2024	2,819,000
Thereafter	814,283,000
Total minimum lease payments	828,103,000
Amount representing interest	(783,655,000)
Lease liability - financing leases	44,448,000	$ 43,616,000
Non-cancellable operating leases
2020	31,508,000
2021	31,702,000
2022	29,548,000
2023	27,243,000
2024	27,263,000
Thereafter	649,289,000
Total minimum lease payments	796,553,000
Amount discounted using incremental borrowing rate	(414,882,000)
Lease liability - operating leases	381,671,000	3,603,000
Minimum sublease rentals to be received in the future	1,600,000,000
Finance lease cost	4,500,000
Finance lease, interest expense	3,243,000	8,069,000	$ 3,098,000
Finance lease, right-of-use asset, amortization	1,200,000
Operating lease, cost	$ 33,188,000	32,965,000	$ 33,231,000
Operating lease, weighted average discount rate, percent	8.49%
Operating lease, weighted average remaining lease term	67 years
711 Third Avenue
Other Commitments [Line Items]
Ownership percentage	50.00%
Belmont
Other Commitments [Line Items]
Loss reserves	$ 2,900,000	$ 4,000,000.0
Ticonderoga
Other Commitments [Line Items]
Loss reserves	$ 0