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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 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 December 31, 2011 and 2010, respectively (in thousands):

 
As of December 31, 2011
 
As of December 31, 2010
 
Financial Instrument
Carrying Value
 
Estimated Fair Value
 
Carrying Value
 
Estimated Fair Value
 
Cash and cash equivalents(1)
$
139,690

 
$
139,690

  
$
56,718

 
$
56,718

 
Tenant receivables, net(1)
$
129,523

 
$
129,523

  
$
134,006

 
$
134,006

 
Accounts payable(1)
$
14,637

 
$
14,637

  
$
15,763

 
$
15,763

 
Interest rate swap agreements
$
2,537

 
$
2,537

  
$
691

 
$
691

 
Interest rate cap agreements
$

 
$

 
N/A

 
N/A

 
Line of credit and notes payable
$
1,472,525

 
$
1,529,811

  
$
1,402,525

 
$
1,428,255

 

(1) 
For the periods presented, the carrying value approximates estimated fair value.