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Related-Party Transactions: (Tables)
 12 Months Ended
Dec. 31, 2014
Related Party Transactions [Abstract]  
Schedule of fees charged to unconsolidated joint ventures
The following are fees charged to unconsolidated joint ventures for the years ended December 31:
 
2014
 
2013
 
2012
Management fees
$
18,705

 
$
21,993

 
$
24,007

Development and leasing fees
11,822

 
10,859

 
13,165

 
$
30,527

 
$
32,852

 
$
37,172