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Property Dispositions and Assets Held for Sale (Property Dispositions) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 05, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 04, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Notes receivable   $ 0 $ 0    
Secured Debt | Secured Promissory Note          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Notes receivable         $ 3,200
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Sarasota Commerce Center II          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain on Sale of Real Estate Assets       $ 6,493  
Net Sales Proceeds       23,090  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Two Independence Square          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain on Sale of Real Estate Assets       109,381  
Net Sales Proceeds       352,428  
Adjustment to gain on sale of real estate assets $ 6,100        
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 8560 Upland Drive          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain on Sale of Real Estate Assets       3,683  
Net Sales Proceeds       $ 12,334  
Piedmont’s ownership percentage   72.00%      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 2017 Disposition Portfolio          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain on Sale of Real Estate Assets     45,275    
Net Sales Proceeds     419,644    
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 800 North Brand Boulevard          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain on Sale of Real Estate Assets     30,416    
Net Sales Proceeds     $ 155,583    
Disposal Group, Disposed of by Sale, Not Discontinued Operations | ONE INDEPENDENCE SQUARE          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain on Sale of Real Estate Assets   $ 33,176      
Net Sales Proceeds   163,623      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | The Dupree          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain on Sale of Real Estate Assets   0      
Net Sales Proceeds   12,631      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 500 WEST MONROE STREET          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain on Sale of Real Estate Assets   157,739      
Net Sales Proceeds   $ 408,851