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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:        
Cash paid for interest, net of capitalized interest $ 42,643 $ 39,042    
Non-cash investing and financing activities        
Accounts payable and accrued liabilities for real estate investments (9,564) (2,460)    
Cash and cash equivalents 48,172 57,515 $ 53,740 $ 78,922
Restricted cash 13,375 8,472 14,451 22,358
TOTAL $ 61,547 $ 65,987 $ 68,191 $ 101,280