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Debt Obligations - Consolidated Debt Obligations Outstanding (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Nov. 09, 2017
Consolidated debt obligations      
Plus: premiums/(discounts), net $ (5,855)    
Net deferred financing costs (10,241)    
Total Debt Obligations 2,028,046 $ 1,930,828  
Secured Debt [Member]      
Consolidated debt obligations      
Long-term Debt, Gross 323,032 320,107  
Plus: premiums/(discounts), net (1,759) (2,325)  
Net deferred financing costs (404) (566)  
Total mortgage indebtedness 320,869 317,216  
Secured Debt [Member] | Two Logan Square [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 82,805 84,440  
Effective interest rate 3.98%    
Debt instrument maturity date May 01, 2020    
Secured Debt [Member] | Four Tower Bridge [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 9,526 0  
Effective interest rate [1] 4.50%    
Debt instrument maturity date Feb. 28, 2021    
Secured Debt [Member] | One Commerce Square [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 120,183 123,667  
Effective interest rate 3.64%    
Debt instrument maturity date Apr. 05, 2023    
Secured Debt [Member] | Two Commerce Square [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 110,518 112,000  
Effective interest rate 4.51%    
Debt instrument maturity date Apr. 05, 2023    
Unsecured Debt [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 1,721,110 1,628,610  
Plus: premiums/(discounts), net (4,096) (4,423)  
Net deferred financing costs (9,837) (10,575)  
Total unsecured indebtedness 1,707,177 1,613,612  
Unsecured Debt [Member] | $600 million Unsecured Credit Facility [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 92,500 0  
Debt instrument, description of variable rate basis LIBOR + 1.10%    
Spread on variable rate 1.10%    
Debt instrument maturity date Jul. 15, 2022    
Unsecured Debt [Member] | Seven Year Term Loan - Swapped to fixed [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 250,000 250,000  
Effective interest rate [2] 2.87%    
Debt instrument maturity date Oct. 08, 2022    
Unsecured Debt [Member] | $350M 3.95% Guaranteed Notes due 2023 [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 350,000 350,000  
Effective interest rate 3.87%    
Debt instrument maturity date Apr. 15, 2018    
Unsecured Debt [Member] | $250.0M 4.10% Guaranteed Notes due 2024 [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 250,000 250,000  
Effective interest rate 4.33%    
Debt instrument maturity date Feb. 15, 2023    
Unsecured Debt [Member] | $450.0M 3.95% Guaranteed Notes due 2027 [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 450,000 450,000 $ 450,000
Effective interest rate 4.03%    
Debt instrument maturity date Oct. 01, 2024    
Unsecured Debt [Member] | $250M 4.55% Guaranteed Notes due 2029 [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 250,000 250,000  
Effective interest rate 4.60%    
Debt instrument maturity date Oct. 01, 2029    
Unsecured Debt [Member] | Indenture IA (Preferred Trust I) [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 27,062 27,062  
Debt instrument, description of variable rate basis LIBOR + 1.25%    
Spread on variable rate 1.25%    
Debt instrument maturity date Mar. 30, 2035    
Unsecured Debt [Member] | Indenture IB (Preferred Trust I) - Swapped to fixed [Member]      
Consolidated debt obligations      
Long-term Debt, Gross $ 25,774 25,774  
Effective interest rate 3.30%    
Debt instrument maturity date Apr. 30, 2035    
Unsecured Debt [Member] | Indenture II (Preferred Trust II) - Swapped to fixed [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 property on January 5, 2018. The interest rate reflects the market rate at the time of acquisition.
[2] On December 13, 2018, the Company amended and restated its $250.0 million seven-year term loan maturing October 8, 2022. In connection with the terms of the amendment, the credit spread on the term loan decreased from LIBOR plus 1.80% to LIBOR plus 1.25%, reducing the Company’s effective interest rate by 0.55%. Through a series of interest rate swaps, the $250.0 million outstanding balance of the term loan has a fixed interest rate of 2.87%.