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Fair Value Measurements - Narrative (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
mall
Mar. 31, 2018
USD ($)
mall
Dec. 31, 2018
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of long-term debt $ 3,556,573   $ 3,740,431
Loss on impairment $ 24,825 $ 18,061  
Number of malls with impairment | mall 2    
Greenbrier Mall and Honey Creek Mall      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loss on impairment $ 25,054    
Outlet Mall and Outparcel Sale      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loss on impairment   $ 18,061  
Number of malls with impairment | mall   1