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Fair Value Measurement of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value Measurement of Financial Instruments [Abstract] 
Fair Value, by Balance Sheet Grouping
The following table sets forth the carrying and estimated fair value for each of Piedmont’s financial instruments as of September 30, 2011 and December 31, 2010 (in thousands):

 
As of September 30, 2011
 
As of December 31, 2010
Financial Instrument
Carrying Value
 
Estimated Fair Value
 
Carrying Value
 
Estimated Fair Value
Cash and cash equivalents(1)
$
16,128

 
$
16,128

 
$
56,718

 
$
56,718

Tenant receivables, net(1)(2)
$
142,884

 
$
142,884

 
$
134,006

 
$
134,006

Accounts payable(1)
$
13,521

 
$
13,521

 
$
15,763

 
$
15,763

Interest rate swap agreements
$

 
$

 
$
691

 
$
691

Interest rate cap agreements
$
3

 
$
3

 
N/A

 
N/A

Line of credit and notes payable(2)
$
1,664,525

 
$
1,722,246

 
$
1,402,525

 
$
1,428,255


(1) 
For the periods presented, the carrying value approximates estimated fair value.
(2) 
For the periods presented, the carrying value and estimated fair value includes assets and liabilities held for sale.