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

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Transaction Related Costs, Impairment Losses and Other - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Transaction Related Costs, Impairment Losses and Other [Line Items]
Non-cash impairment loss	$ 101,360	$ 0	$ 101,360	$ 0
Operating lease, impairment loss			75,220	$ 0
Lease liabilities	483,011		483,011		$ 0
608 Fifth Avenue
Transaction Related Costs, Impairment Losses and Other [Line Items]
Non-cash impairment loss	93,860
Operating lease, impairment loss	75,220
Lease liabilities	$ 72,588		$ 72,588