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Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Measured at fair value on a recurring basis      
Restricted cash $ 38,448 $ 21,090 $ 21,491
Disclosed at fair value      
Carrying value of mortgage notes, term loans and construction loan 1,376,998    
Level 3      
Disclosed at fair value      
Mortgage notes, term loans and construction loan (1) 1,398,070 1,807,199  
Measured at fair value on a recurring basis | Level 1      
Measured at fair value on a recurring basis      
Cash and cash equivalents 226,807 48,873  
Restricted cash 38,448 21,090  
Measured at fair value on a recurring basis | Level 2 | Interest rate swap liability      
Measured at fair value on a recurring basis      
Interest rate swap liability 1,857 2,463  
Measured at fair value on a non-recurring basis | Level 3      
Long-lived assets written down      
Property, plant and equipment $ 0 $ 2,576