Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of gain (loss) on termination of lease before expiration of lease term.

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Amount of loss from impairment of right-of-use asset from operating lease.

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(Expense from Transaction Related Costs and Impairment Losses) and Gain from Lease Liability Extinguishment, Net (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Transaction Related Costs, Impairment Losses and Other [Line Items]
Non-cash impairment loss	$ 0	$ 0		$ 0	$ 7,500
608 Fifth Avenue
Transaction Related Costs, Impairment Losses and Other [Line Items]
Non-cash impairment loss			$ 93,860
Non-cash impairment loss on 608 Fifth Avenue right-of-use asset			$ 75,220
Gain from termination of lease				$ 70,260