v3.3.1.900

Secured and Unsecured Debt of the Operating Partnership (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |
Interest Expense For Exchangeable Notes [Table Text Block] |  | The following table summarizes the total interest expense attributable to the 4.25% Exchangeable Notes prior to maturity in November 2014, based on the effective interest rates, before the effect of capitalized interest, for the years ended December 31, 2014 and 2013:
| Year Ended December 31,
| 2014 |  | 2013
Contractual interest payments | $ | 5,608 |  |  | $ | 7,331 |
Amortization of discount | 3,769 |  |  | 4,427 |
Interest expense attributable to the 4.25% Exchangeable Notes | $ | 9,377 |  |  | $ | 11,758 |
Per Share Average Trading Price Of Companys Common Stock On Stock Exchange [Tables Text Block] |  | For the respective reporting periods noted below, which preceding maturity of the 4.25% Exchangeable Notes on November 15, 2014, the per share average trading price of the Company's common stock on the NYSE was higher than the $35.93 exchange price for the 4.25% Exchangeable Notes, as presented in the table below. See Note 20 “Net Income Available to Common Stockholders Per Share of the Company” and Note 21 “Net Income Available to Common Unitholders Per Unit of the Operating Partnership” for a discussion of the impact of the 4.25% Exchangeable Notes on our diluted earnings per share and unit calculations for the years ended December 31, 2014 and 2013.
| Period Ended November 15, 2014(1) |  | Year Ended December 31, 2013
Per share average trading price of the Company's common stock | $ | 60.04 |  |  | $ | 52.12 |
_______________ (1) Represents the maturity date of the 4.25% Exchangeable Notes.
Debt Instrument Redemption [Table Text Block] |  | The table below summarizes the significant terms of the Company’s $172.5 million 4.25% Exchangeable Notes due November 2014 (the “4.25% Exchangeable Notes”) prior to their repayment upon maturity in November 2014.
4.25% Exchangeable Notes |  | December 31, 2014
Issuance date |  | November 2009
Maturity date |  | November 2014
Stated coupon rate (1) |  | 4.25%
Effective interest rate (2) |  | 7.13%
Exchange rate per $1,000 principal value of the 4.25% Exchangeable Notes, as adjusted (3) |  | 27.8307
Exchange price as adjusted (3) |  | $35.93
Number of shares on which the aggregate consideration to be delivered on conversion (3) |  | 4,800,796
_______________
(1) | Interest on the 4.25% Exchangeable Notes was payable semi-annually in arrears on May 15th and November 15th of each year.
(2) | Represents the rate at which we record interest expense for financial reporting purposes, which reflects the amortization of the discounts on the 4.25% Exchangeable Notes. This rate represents our conventional debt borrowing rate at the date of issuance.
(3) | The exchange rate, exchange price, and the number of shares to be delivered upon conversation were subject to adjustment under certain circumstances, including increases in our common dividends as of December 31, 2014.
Kilroy Realty, L.P. [Member] |  |
Debt Instrument [Line Items] |  |
Schedule of Line of Credit Facilities [Table Text Block] | The following table summarizes the balance and terms of our unsecured revolving credit facility as of December 31, 2015 and December 31, 2014:
| December 31, 2015 |  | December 31, 2014
| (in thousands)
Outstanding borrowings | $ | — |  |  | $ | 140,000 |
Remaining borrowing capacity | 600,000 |  |  | 460,000 |
Total borrowing capacity (1) | $ | 600,000 |  |  | $ | 600,000 |
Interest rate (2) | — | % |  | 1.41 | %
Facility fee-annual rate (3) | 0.200% |  | 0.250%
Maturity date | July 2019
_______________
(1) | We may elect to borrow, subject to bank approval and obtaining commitments for any additional borrowing capacity, up to an additional $311.0 million under an accordion feature under the terms of the unsecured revolving credit facility and unsecured term loan facility.
(2) | Our unsecured revolving credit facility interest rate was calculated based on an annual rate of LIBOR plus 1.050% and LIBOR plus 1.250% as of December 31, 2015 and December 31, 2014, respectively.
(3) | Our facility fee is paid on a quarterly basis and is calculated based on the total borrowing capacity. In addition to the facility fee, we incurred debt origination and legal costs. As of December 31, 2015, $4.6 million of deferred financing costs remains to be amortized through the amended maturity date of our unsecured revolving credit facility.
Schedule of Term Loan Facilities [Table Text Block] | The following table summarizes the balance and terms of our term loan facility, which is included in our unsecured debt, as of December 31, 2015 and December 31, 2014:
| December 31, 2015 |  | December 31, 2014
| (in thousands)
Outstanding borrowings | $ | 150,000 |  |  | $ | 150,000 |
Interest rate (1) | 1.40 | % |  | 1.56 | %
Maturity date | July 2019 |  |  | July 2019 |
_______________
(1) | Our unsecured term loan facility interest rate was calculated based on an annual rate of LIBOR plus 1.150% and LIBOR plus 1.400% as of December 31, 2015 and December 31, 2014, respectively.
Stated debt maturities and scheduled amortization payments, excluding debt discounts | The following table summarizes the stated debt maturities and scheduled amortization payments as of December 31, 2015:
Year | (in thousands)
2016 | $ | 9,734 |
2017 | 71,734 |
2018 | 451,713 |
2019 | 265,355 |
2020 | 251,962 |
Thereafter | 1,189,198 |
Total aggregate principal value | $ | 2,239,696 |
Less net unamortized discounts | (1,188 | )
Total debt, net of unamortized discounts | $ | 2,238,508 |
Capitalized interest and loan fees | The following table sets forth gross interest expense reported in continuing operations, including debt discount/premium and loan cost amortization, net of capitalized interest, for the years ended December 31, 2015, 2014 and 2013. The interest expense capitalized was recorded as a cost of development and redevelopment, and increased the carrying value of undeveloped land and construction in progress.
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
| (in thousands)
Gross interest expense | $ | 109,647 |  |  | $ | 114,661 |  |  | $ | 111,238 |
Capitalized interest | (51,965 | ) |  | (47,090 | ) |  | (35,368 | )
Interest expense | $ | 57,682 |  |  | $ | 67,571 |  |  | $ | 75,870 |
Kilroy Realty, L.P. [Member] | Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Debt balance and significant terms | The following table sets forth the composition of our secured debt as of December 31, 2015 and 2014:
| Annual Stated Interest Rate (1) |  | GAAP Effective Rate (1)(2) |  | Maturity Date |  | December 31,
Type of Debt |  |  |  | 2015 (3) |  | 2014 (3)
|  |  |  |  |  |  | (in thousands)
Mortgage note payable (5) | 4.27% |  | 4.27% |  | February 2018 |  | $ | 128,315 |  |  | $ | 130,767 |
Mortgage note payable (5) | 4.48% |  | 4.48% |  | July 2027 |  | 96,354 |  |  | 97,000 |
Mortgage note payable (4)(5) | 6.05% |  | 3.50% |  | June 2019 |  | 85,890 |  |  | 89,242 |
Mortgage note payable | 6.51% |  | 6.51% |  | February 2017 |  | 65,563 |  |  | 66,647 |
Mortgage note payable | 7.15% |  | 7.15% |  | May 2017 |  | 3,987 |  |  | 6,568 |
Mortgage note payable (5)(6) | 5.23% |  | 3.50% |  | January 2016 |  | — |  |  | 52,793 |
Mortgage note payable (5)(6) | 5.57% |  | 3.25% |  | February 2016 |  | — |  |  | 40,258 |
Mortgage note payable (5) | 5.09% |  | 3.50% |  | August 2015 |  | — |  |  | 34,311 |
Mortgage note payable | 4.94% |  | 4.00% |  | April 2015 |  | — |  |  | 26,285 |
Other (7) | Various |  | Various |  | Various |  | 1,809 |  |  | 2,421 |
Total |  |  |  |  |  |  | $ | 381,918 |  |  | $ | 546,292 |
______________
(1) | All interest rates presented are fixed-rate interest rates.
(2) | 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.
(3) | 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.
(4) | 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.
(5) | 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.
(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.
Kilroy Realty, L.P. [Member] | Exchangeable Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt balance and significant terms | Uns |
Kilroy Realty, L.P. [Member] | Unsecured Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt balance and significant terms | The following table summarizes the balance and significant terms of the registered unsecured senior notes issued by the Operating Partnership as of December 31, 2015 and 2014:
|  |  |  |  |  |  |  |  | Principal Amount as of December 31,
| Issuance date |  | Maturity date |  | Stated coupon rate |  | Effective interest rate (1) |  | 2015 |  | 2014
|  |  |  |  |  |  |  |  | (in thousands)
4.375% Unsecured Senior Notes (2) | September 2015 |  | October 2025 |  | 4.375% |  | 4.440% |  | $ | 400,000 |  |  | $ | — |
Unamortized discount |  |  |  |  |  |  |  |  | (2,159 | ) |  | $ | — |
Net carrying amount |  |  |  |  |  |  |  |  | $ | 397,841 |  |  | $ | — |
4.250% Unsecured Senior Notes (3) | July 2014 |  | August 2029 |  | 4.250% |  | 4.350% |  | $ | 400,000 |  |  | $ | 400,000 |
Unamortized discount |  |  |  |  |  |  |  |  | (4,050 | ) |  | (4,348 | )
Net carrying amount |  |  |  |  |  |  |  |  | $ | 395,950 |  |  | $ | 395,652 |
3.800% Unsecured Senior Notes (4) | January 2013 |  | January 2023 |  | 3.800% |  | 3.804% |  | $ | 300,000 |  |  | $ | 300,000 |
Unamortized discount |  |  |  |  |  |  |  |  | (70 | ) |  | (79 | )
Net carrying amount |  |  |  |  |  |  |  |  | $ | 299,930 |  |  | $ | 299,921 |
4.800% Unsecured Senior Notes (4)(5) | July 2011 |  | July 2018 |  | 4.800% |  | 4.827% |  | $ | 325,000 |  |  | $ | 325,000 |
Unamortized discount |  |  |  |  |  |  |  |  | (191 | ) |  | (265 | )
Net carrying amount |  |  |  |  |  |  |  |  | $ | 324,809 |  |  | $ | 324,735 |
6.625% Unsecured Senior Notes (6) | May 2010 |  | June 2020 |  | 6.625% |  | 6.743% |  | $ | 250,000 |  |  | $ | 250,000 |
Unamortized discount |  |  |  |  |  |  |  |  | (940 | ) |  | (1,154 | )
Net carrying amount |  |  |  |  |  |  |  |  | $ | 249,060 |  |  | $ | 248,846 |
5.000% Unsecured Senior Notes (7) | November 2010 |  | November 2015 |  | 5.000% |  | 5.014% |  | $ | — |  |  | $ | 325,000 |
Unamortized discount |  |  |  |  |  |  |  |  | — |  |  | (33 | )
Net carrying amount |  |  |  |  |  |  |  |  | $ | — |  |  | $ | 324,967 |
Total Unsecured Senior Notes, Net |  |  |  |  |  |  |  |  | $ | 1,667,590 |  |  | $ | 1,594,121 |
________________________
(1) | This represents the rate at which interest expense is recorded for financial reporting purposes, which reflects the amortization of initial issuance discounts, excluding debt issuance costs.
(2) | Interest on these notes is payable semi-annually in arrears on April 1st and October 1st of each year.
(3) | Interest on these notes is payable semi-annually in arrears on February 15th and August 15th of each year.
(4) | Interest on these notes is payable semi-annually in arrears on January 15th and July 15th of each year.
(5) | In October 2015, certain common limited partners in the Operating Partnership that previously contributed their interests in the property at 6255 W. Sunset Blvd., Los Angeles, California to the Operating Partnership entered into an agreement with the Company. Pursuant to this agreement, such common limited partners will reimburse the Company for a portion of any amounts the Company may be required to pay pursuant to its guarantee of the Operating Partnership's 4.800% Senior Notes due 2018 or that the Company may otherwise become required to pay under applicable law with respect to such notes.
(6) | Interest on these notes is payable semi-annually in arrears on June 1st and December 1st of each year.
(7) | Interest of these notes is payable semi-annually in arrears on May 3rd and November 3rd of each year.

X
- Definition Capitalized interest and loan fees. + References No definition available. + Details
Name: | krc_CapitalizedInterestAndLoanFeesTableTextBlock
Namespace Prefix: | krc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Interest expense for the exchangeable notes. + References No definition available. + Details
Name: | krc_InterestExpenseForExchangeableNotesTableTextBlock
Namespace Prefix: | krc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share average trading price of companys common stock on stock exchange. + References No definition available. + Details
Name: | krc_PerShareAverageTradingPriceOfCompanysCommonStockOnStockExchangeTablesTextBlock
Namespace Prefix: | krc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule of Term Loan Facilities [Table Text Block] + References No definition available. + Details
Name: | krc_ScheduleofTermLoanFacilitiesTableTextBlock
Namespace Prefix: | krc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of debt instruments or arrangements with redemption features. Includes, but is not limited to, description of debt redemption features, percentage price at which debt can be redeemed by the issuer, and period start and end for debt maturity or redemption. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentRedemptionTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
Name: | us-gaap_ScheduleOfDebtTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_ScheduleOfLineOfCreditFacilitiesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
Name: | us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=us-gaap_SubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_ExchangeableDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |