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Summary Of Significant Accounting Policies (Supplemental Cash Flow Disclosures) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Supplemental Cash Flow Information [Abstract]      
Total interest costs incurred $ 125,684 $ 113,016 $ 110,675
Interest capitalized 25,559 18,022 18,122
Interest expense 100,125 94,994 92,553
Cash paid for interest, net of amounts capitalized 105,201 90,185 116,335
Cash paid for income taxes 352 296 274
NON-CASH INVESTING AND FINANCING TRANSACTIONS:      
Mortgage loans refinanced 166,823 0 0
Mortgage loans assumed with acquisition 79,401 34,385 89,516
DownREIT operating partnership units issued with acquisition 5,918 0 7,742
DownREIT operating partnership units redeemed for common shares 2,569 18,679 4,114
Shares issued under dividend reinvestment plan $ 2,017 $ 2,017 $ 1,977
Minimum | Retail and commercial      
Operating Leased Assets [Line Items]      
Operating lease, term 3 years    
Maximum | Retail and commercial      
Operating Leased Assets [Line Items]      
Operating lease, term 10 years