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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:        
Cash paid for interest, net of capitalized interest $ 50,692 $ 47,852    
NON-CASH INVESTING AND FINANCING ACTIVITIES:        
Accounts payable and accrued liabilities for investment in property 12,624 (6,740)    
Reclassification of investment in unconsolidated entities for real estate investments 0 7,835    
Assumption of debt in connection with property acquisitions 139,003 0    
Asset Acquisition, Consideration Transferred, Other Assets Assumed 12,749 0    
Cash and cash equivalents 52,456 87,723 $ 78,922 $ 83,015
Restricted cash 10,782 25,784 22,358 25,177
Total $ 63,238 $ 113,507 $ 101,280 $ 108,192