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Debt Obligations - Consolidated Debt Obligations Outstanding (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Consolidated debt obligations    
Plus: premiums/(discounts), net $ (6,031)  
Less: deferred financing costs (9,928)  
Total Debt Obligations 1,937,537 $ 1,930,828
Secured Debt [Member]    
Consolidated debt obligations    
Long-term Debt, Gross 324,886 320,107
Plus: premiums/(discounts), net (1,853) (2,325)
Less: deferred financing costs (445) (566)
Total mortgage indebtedness 322,588 317,216
Unsecured Debt [Member]    
Consolidated debt obligations    
Long-term Debt, Gross 1,628,610 1,628,610
Plus: premiums/(discounts), net (4,178) (4,423)
Less: deferred financing costs (9,483) (10,575)
Total unsecured indebtedness 1,614,949 1,613,612
Two Logan Square [Member] | Secured Debt [Member]    
Consolidated debt obligations    
Long-term Debt, Gross $ 83,220 84,440
Effective interest rate 3.98%  
Debt instrument maturity date May 01, 2020  
Four Tower Bridge [Member] | Secured Debt [Member]    
Consolidated debt obligations    
Long-term Debt, Gross $ 9,583  
Effective interest rate [1] 4.50%  
Debt instrument maturity date Feb. 28, 2021  
One Commerce Square [Member] | Secured Debt [Member]    
Consolidated debt obligations    
Long-term Debt, Gross $ 121,066 123,667
Effective interest rate 3.64%  
Debt instrument maturity date Apr. 05, 2023  
Two Commerce Square [Member] | Secured Debt [Member]    
Consolidated debt obligations    
Long-term Debt, Gross $ 111,017 112,000
Effective interest rate 4.51%  
Debt instrument maturity date Apr. 05, 2023  
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  
$350M 3.95% Guaranteed Notes due 2023 [Member] | Unsecured Debt [Member]    
Consolidated debt obligations    
Long-term Debt, Gross $ 350,000 350,000
Effective interest rate 3.87%  
Debt instrument maturity date Apr. 15, 2018  
$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 Feb. 15, 2023  
$450.0M 3.95% Guaranteed Notes due 2027 [Member] | Unsecured Debt [Member]    
Consolidated debt obligations    
Long-term Debt, Gross $ 450,000 450,000
Effective interest rate 4.03%  
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) [Member] | Unsecured Debt [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  
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 property on January 5, 2018. The interest rate reflects the market rate at the time of acquisition.