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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jan. 01, 2018
Dec. 31, 2017
Variable Interest Entity [Line Items]        
Deferred tax assets $ 31,517     $ 29,006
Financing arrangement obligation 398,091     0
Accumulated deficit (1,393,418)     (830,279)
Increase in net cash provided by investing activities (311,401) $ (207,166)    
ASU 2016-18        
Variable Interest Entity [Line Items]        
Increase in net cash provided by investing activities   $ (63)    
Joint Venture | Chandler Freehold | Difference between revenue guidance in effect before and after topic 606 | ASU 2014-09 | Financing Arrangement        
Variable Interest Entity [Line Items]        
Financing arrangement obligation     $ 393,709  
Accumulated deficit 424,859      
Joint Venture | Chandler Freehold        
Variable Interest Entity [Line Items]        
Distributions in excess of co-venture obligation 0      
Joint Venture | Chandler Freehold | Financing Arrangement        
Variable Interest Entity [Line Items]        
Distributions in excess of co-venture obligation       31,150
Operating Partnership        
Variable Interest Entity [Line Items]        
Total assets 347,842     349,467
Total liabilities 203,290     202,141
Operating Partnership | Property, net        
Variable Interest Entity [Line Items]        
Total assets 288,521     288,881
Operating Partnership | Other assets        
Variable Interest Entity [Line Items]        
Total assets 59,321     60,586
Operating Partnership | Mortgage notes payable        
Variable Interest Entity [Line Items]        
Total liabilities 128,449     129,436
Operating Partnership | Other liabilities        
Variable Interest Entity [Line Items]        
Total liabilities $ 74,841     $ 72,705