v3.3.1.900
Secured and Unsecured Debt of the Operating Partnership Secured and Unsecured Debt of the Operating Partnership - Secured Debt (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
loans
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]      
Unsecured Debt $ 1,856,590   $ 1,783,121
Secured Debt      
Debt premium   $ 6,200  
Principal amount     172,500
Secured debt (Notes 3, 6, 7 and 16) 381,918   546,292
Secured Debt [Member]      
Secured Debt      
Debt premium 6,200    
Unamortized discount (premium), Net     (10,300)
Kilroy Realty, L.P. [Member]      
Debt Instrument [Line Items]      
Unsecured Debt 1,856,590   1,783,121
Secured Debt      
Secured debt (Notes 3, 6, 7 and 16) 381,918   546,292
Kilroy Realty, L.P. [Member] | Secured Debt [Member]      
Secured Debt      
Net book value of properties pledged as collateral for secured debt $ 600,000    
Number of secured loans with restrictions | loans 5    
Number of secured debt | loans 6    
Secured debt (Notes 3, 6, 7 and 16) [1] $ 381,918   546,292
Kilroy Realty, L.P. [Member] | Secured Debt [Member] | 4.27% Mortgage Payable due Feb 1, 2018 [Member]      
Secured Debt      
Stated interest rate [2] 4.27%    
Effective interest rate [2],[3] 4.27%    
Maturity date Feb. 01, 2018    
Secured debt (Notes 3, 6, 7 and 16) $ 128,315   130,767
Kilroy Realty, L.P. [Member] | Secured Debt [Member] | 4.48% Mortgage Payable due July 2027      
Secured Debt      
Stated interest rate [2] 4.48%    
Effective interest rate [2],[3] 4.48%    
Maturity date Jul. 01, 2027    
Secured debt (Notes 3, 6, 7 and 16) [1],[4] $ 96,354   97,000
Kilroy Realty, L.P. [Member] | Secured Debt [Member] | 6.05% Mortgage Payable Due June 1, 2019 [Member]      
Secured Debt      
Stated interest rate [2] 6.05%    
Effective interest rate [2],[3] 3.50%    
Maturity date Jun. 01, 2019    
Debt premium $ 6,200   8,000
Secured debt (Notes 3, 6, 7 and 16) [1],[4],[5] $ 85,890   89,242
Kilroy Realty, L.P. [Member] | Secured Debt [Member] | 6.51% Mortgage Payable due February 1, 2017 [Member]      
Secured Debt      
Stated interest rate [2] 6.51%    
Effective interest rate [2],[3] 6.51%    
Maturity date Feb. 01, 2017    
Secured debt (Notes 3, 6, 7 and 16) [1] $ 65,563   66,647
Kilroy Realty, L.P. [Member] | Secured Debt [Member] | 5.23% Mortgage Payable due January 2016 [Member]      
Secured Debt      
Stated interest rate [2] 5.23%    
Effective interest rate [2],[3] 3.50%    
Maturity date Jan. 01, 2016    
Secured debt (Notes 3, 6, 7 and 16) [1],[6] $ 0   52,793
Kilroy Realty, L.P. [Member] | Secured Debt [Member] | 5.57% Mortgage Note Payable due February 2016 [Member]      
Secured Debt      
Stated interest rate [2] 5.57%    
Effective interest rate [2],[3] 3.25%    
Maturity date Feb. 11, 2016    
Secured debt (Notes 3, 6, 7 and 16) [1],[6] $ 0   40,258
Kilroy Realty, L.P. [Member] | Secured Debt [Member] | 5.09% Mortgage Payable due August 2015 [Member] [Member]      
Secured Debt      
Stated interest rate [2] 5.09%    
Effective interest rate [2],[3] 3.50%    
Maturity date Aug. 07, 2015    
Secured debt (Notes 3, 6, 7 and 16) [1] $ 0   34,311
Kilroy Realty, L.P. [Member] | Secured Debt [Member] | Four Point Nine four Percent Mortgage Payable due April Fifteen Two Thousand Fifteen [Member]      
Secured Debt      
Stated interest rate [2] 4.94%    
Effective interest rate [2],[3] 4.00%    
Maturity date Apr. 15, 2015    
Secured debt (Notes 3, 6, 7 and 16) [1] $ 0   26,285
Kilroy Realty, L.P. [Member] | Secured Debt [Member] | 7.15% Mortgage Payable due May 1, 2017 [Member]      
Secured Debt      
Stated interest rate [2] 7.15%    
Effective interest rate [2],[3] 7.15%    
Maturity date May 01, 2017    
Secured debt (Notes 3, 6, 7 and 16) [1] $ 3,987   6,568
Kilroy Realty, L.P. [Member] | Secured Debt [Member] | Other [Member]      
Secured Debt      
Secured debt (Notes 3, 6, 7 and 16) 600    
Secured debt (Notes 3, 6, 7 and 16) [1],[7] 1,809   $ 2,421
Secured Debt [Member]      
Secured Debt      
Secured debt (Notes 3, 6, 7 and 16) $ 561    
[1] Amounts reported include the amounts of unamortized debt premiums of $6.2 million and $10.3 million as of December 31, 2015 and 2014, respectively.
[2] All interest rates presented are fixed-rate interest rates.
[3] This represents the rate at which interest expense is recorded for financial reporting purposes, which reflects the amortization of discounts/premiums, excluding debt issuance costs.
[4] The secured debt and the related properties that secure the debt are held in a special purpose entity and the properties are not available to satisfy the debts and other obligations of the Company or the Operating Partnership.
[5] In January 2013, in connection with the acquisition of two office buildings in Seattle, Washington, we assumed a mortgage loan that is secured by the project. The loan requires monthly principal and interest payments based on a 6.4 year amortization period. As of December 31, 2015 and 2014, the mortgage loan had unamortized debt premiums of $6.2 million and $8.0 million, respectively.
[6] These mortgage notes payable were repaid during the year ended December 31, 2015 at par.
[7] Excludes $0.6 million of secured debt related to real estate assets held for sale as of December 31, 2015.