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Indebtedness (Tables)
 6 Months Ended
Jun. 30, 2013
Debt Disclosure [Abstract]  
Fair Value, Liabilities Measured on a Recurring Basis, Disclosure Only
 
Book Value
at 12/31/12
 
Book Value
at 6/30/13
 
Fair Value
at 12/31/12
 
Issuances and
Assumptions
 
Payments/Payoffs
 
Adjustments
to Fair Value
 
Fair Value
at 6/30/13
Fixed rate secured debt
$
1,149,541

 
$
1,221,348

 
$
1,251,477

 
$
103,638

 
$
(30,349
)
 
$
(15,971
)
 
$
1,308,795

Variable rate secured debt
18,412

 
20,179

 
18,386

 
1,933

 
—

 
(170
)
 
20,149

Unsecured debt
2,993,217

 
3,067,250

 
3,336,386

 
500,000

 
(425,967
)
 
(119,387
)
 
3,291,032

Unsecured line of credit
285,000

 
88,000

 
285,632

 
—

 
(197,000
)
 
(632
)
 
88,000

Total
$
4,446,170

 
$
4,396,777

 
$
4,891,881

 
$
605,571

 
$
(653,316
)
 
$
(136,160
)
 
$
4,707,976
Unsecured Line of Credit
Description
Maximum
Capacity
 
Maturity Date
 
Outstanding
Balance at
June 30, 2013
Unsecured Line of Credit - Partnership
$
850,000

 
December 2015
 
$
88,000