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Basis of Presentation and Recently Issued Accounting Pronouncements (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Net change in net cash used in investing activities   $ (22,779) $ 18,858    
Accounting Standards Update 2016-18          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Net change in net cash used in investing activities     42,150    
Restricted cash $ 11,450   11,450 $ 0 $ 6,650
Accounting Standards Update 2017-05          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Adjustment to retained earnings       12,756  
General and Administrative Expense | Restatement Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Reclassification of non-recoverable payroll (912)   (1,827)    
Property Operating Expense | Restatement Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Reclassification of non-recoverable payroll $ 912   1,827    
Distributions in excess of accumulated net income | Accounting Standards Update 2017-05          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Adjustment to retained earnings [1]       $ 12,756  
Restatement Adjustment | Accounting Standards Update 2016-18          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Net change in net cash used in investing activities     $ (4,800)    
[1] See Note 2. Recently Issued Accounting Pronouncements Adopted.