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Debt Obligations - Consolidated Debt Obligations Outstanding (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Consolidated debt obligations      
Plus: premiums/(discounts), net $ (6,371)    
Less: deferred financing costs (6,956)    
Line of credit 178,000 $ 0  
Total Debt Obligations 1,889,640 2,013,112  
Secured Debt [Member]      
Consolidated debt obligations      
Long-term Debt, Gross 321,357 325,038  
Plus: premiums/(discounts), net (2,434) (2,761)  
Less: deferred financing costs (606) (728)  
Total mortgage indebtedness 318,317 321,549  
Unsecured Debt [Member]      
Consolidated debt obligations      
Long-term Debt, Gross 1,581,610 1,703,610  
Plus: premiums/(discounts), net (3,937) (4,678)  
Less: deferred financing costs (6,350) (7,369)  
Total unsecured indebtedness 1,571,323 1,691,563  
Two Logan Square [Member] | Secured Debt [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 84,839 86,012  
Effective interest rate 3.98%    
Debt instrument maturity date May 01, 2020    
One Commerce Square [Member] | Secured Debt [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 124,518 127,026  
Effective interest rate 3.64% [1]   3.64%
Debt instrument maturity date Apr. 05, 2023    
Two Commerce Square [Member] | Secured Debt [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 112,000 112,000  
Effective interest rate [2] 4.51%    
Debt instrument maturity date Apr. 05, 2023    
Revolving Credit Facility [Member] | Unsecured Debt [Member]      
Consolidated debt obligations      
Line of credit $ 178,000    
Effective interest rate, description LIBOR + 1.20%    
Debt instrument maturity date May 31, 2019    
Revolving Credit Facility [Member] | Unsecured Debt [Member] | LIBOR [Member]      
Consolidated debt obligations      
Spread on variable rate 1.20%    
Seven Year Term Loan - Swapped to fixed [Member] | Unsecured Debt [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 250,000 250,000  
Effective interest rate 3.72%    
Debt instrument maturity date Oct. 01, 2022    
$300.0M 5.70% Guaranteed Notes due 2017 [Member] | Unsecured Debt [Member]      
Consolidated debt obligations      
Long-term Debt, Gross [3]   300,000  
Effective interest rate [3] 5.68%    
Debt instrument maturity date [3] May 01, 2017    
$325.0M 4.95% Guaranteed Notes due 2018 [Member] | Unsecured Debt [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 325,000 325,000  
Effective interest rate 5.13%    
Debt instrument maturity date Apr. 15, 2018    
$250M 3.95% Guaranteed Notes due 2023 [Member] | Unsecured Debt [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 250,000 250,000  
Effective interest rate 4.02%    
Debt instrument maturity date Feb. 15, 2023    
250.0M 4.10% Guaranteed Notes due 2024 [Member] | Unsecured Debt [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 250,000 250,000  
Effective interest rate 4.33%    
Debt instrument maturity date Oct. 01, 2024    
$250M 4.55% Guaranteed Notes due 2029 [Member] | Unsecured Debt [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 250,000 250,000  
Effective interest rate 4.60%    
Debt instrument maturity date Oct. 01, 2029    
Indenture IA (Preferred Trust I) - Swapped to fixed [Member] | Unsecured Debt [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 27,062 27,062  
Effective interest rate 2.75%    
Debt instrument maturity date Mar. 30, 2035    
Indenture IB (Preferred Trust I) - Swapped to fixed [Member] | Unsecured Debt [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 25,774 25,774  
Effective interest rate 3.30%    
Debt instrument maturity date Apr. 30, 2035    
Indenture II (Preferred Trust II) - Swapped to fixed [Member] | Unsecured Debt [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 25,774 $ 25,774  
Effective interest rate 3.09%    
Debt instrument maturity date Jul. 30, 2035    
[1] This loan was assumed upon acquisition of the related properties on December 19, 2013. On December 29, 2015, the Company refinanced the debt increasing the principal balance to $130.0 million and extended the scheduled maturity date from January 6, 2016 to April 5, 2023.  The effective interest rate as of December 31, 2015 was 3.64%.  A default under this loan will also constitute a default under the loan secured by Two Commerce Square. This loan is also secured by a lien on Two Commerce Square.
[2] This loan was assumed upon acquisition of the related property on December 19, 2013. The interest rate reflects the market rate at the time of acquisition. A default under this loan will also constitute a default under the loan secured by One Commerce Square. This loan is also secured by a lien on One Commerce Square.
[3] On May 1, 2017, the entire principal balance of the unsecured 5.70% Guaranteed Notes was repaid upon maturity. Available cash balances and the Credit Facility (as defined below) were used to fund the repayment of the unsecured notes.