Combined Guarantor Subsidiaries - Fair Value Measurements - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) mall	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of long-term debt	$ 3,283,919		$ 3,283,919		$ 3,740,431
Loss on impairment	135,688	$ 14,600	$ 202,121	$ 84,644
Number of malls with impairment | mall			5
Guarantor Subsidiaries
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of long-term debt	246,104		$ 246,104		$ 319,222
Loss on impairment	$ 0	$ 0	$ 22,770	$ 0
Number of malls with impairment | mall			1