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Indebtedness (Tables)
 9 Months Ended
Sep. 30, 2015
Debt Disclosure [Abstract]  
Fair Value, Liabilities Measured on a Recurring Basis, Disclosure Only
 
Book Value at 12/31/2014
 
Book Value at 9/30/2015
 
Fair Value at 12/31/2014
 
Payments/Payoffs
 
Adjustments
to Fair Value
 
Fair Value at 9/30/2015
Fixed rate secured debt
$
979,842

 
$
761,607

 
$
1,065,301

 
$
(216,532
)
 
$
(21,995
)
 
$
826,774

Variable rate secured debt
3,400

 
3,100

 
3,400

 
(300
)
 
—

 
3,100

Unsecured debt
3,364,161

 
2,681,313

 
3,603,475

 
(682,848
)
 
(120,237
)
 
2,800,390

Unsecured line of credit
106,000

 
—

 
106,000

 
(106,000
)
 
—

 
—

Total
$
4,453,403

 
$
3,446,020

 
$
4,778,176

 
$
(1,005,680
)
 
$
(142,232
)
 
$
3,630,264

Less secured debt related to real estate assets held-for-sale
40,764

 
—

 
 
 
 
 
 
 
 
Total indebtedness as reported on consolidated balance sheets
$
4,412,639

 
$
3,446,020

 
 
 
 
 
 
 
 
Unsecured Line of Credit
Description
Maximum
Capacity
 
Maturity Date
 
Outstanding Balance at September 30, 2015
Unsecured Line of Credit - Partnership
$
1,200,000

 
January 2019
 
$
—