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Investments in Joint Ventures (Aggregate Balance Sheet And Statement Of Income Data For Unconsolidated Joint Ventures) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Investments in Joint Ventures [Abstract]          
Total assets $ 705,000   $ 705,000   $ 715,900
Total third-party debt 512,600   512,600   514,500
Total equity 171,100   171,100   $ 174,500
Total revenues 31,700 $ 30,400 62,800 $ 60,400  
Net income 3,900 3,700 7,600 7,500  
Equity in income (1) [1] $ 1,872 $ 1,785 $ 3,701 $ 3,602  
[1] Equity in income excludes our ownership interest of fee income from various services provided by us to the Funds.