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Net Change in Operating Accounts (Effect Of Changes In The Operating Accounts On Cash Flows From Operating Activities) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Increase (Decrease) in Operating Capital [Abstract]    
Other assets, net $ 2,280 $ (1,819)
Accounts payable and accrued expenses (10,409) (15,453)
Accrued real estate taxes 922 (482)
Other liabilities 2,733 5,518
Other 1,403 1,439
Change in operating accounts and other $ (3,071) $ (10,797)