CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 69,770	$ 89,009
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of real estate assets and leasing costs	148,419	131,982
Depreciation of non-real estate furniture, fixtures and equipment	6,036	2,405
Revenue reversals (recoveries) for doubtful accounts (Note 8)	12,381	(3,091)
Non-cash amortization of share-based compensation awards	18,311	14,082
Non-cash amortization of deferred financing costs and debt discounts and premiums	1,076	717
Non-cash amortization of net below market rents	(4,500)	(4,415)
Gain on sale of depreciable operating properties	0	(7,169)
Non-cash amortization of deferred revenue related to tenant-funded tenant improvements	(8,793)	(8,181)
Straight-line rents	(33,514)	(29,937)
Amortization of right of use ground lease assets	408	291
Net change in other operating assets	13,991	(15,540)
Net change in other operating liabilities	437	(4,493)
Net cash provided by operating activities	224,022	165,660
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for development properties and undeveloped land	(293,711)	(372,750)
Expenditures for operating properties and other capital assets	(80,630)	(61,557)
Net proceeds received from dispositions	0	17,271
Net cash used in investing activities	(374,341)	(417,036)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from issuance of common stock (Note 4)	721,749	0
Proceeds from the issuance of unsecured debt (Note 3)	350,000	0
Borrowings on unsecured revolving credit facility (Note 3)	190,000	425,000
Repayments on unsecured revolving credit facility (Note 3)	(435,000)	(95,000)
Principal payments and repayments of secured debt (Note 3)	(2,543)	(75,384)
Financing costs	(2,283)	(1,335)
Repurchase of common stock and restricted stock units	(10,534)	(12,618)
Proceeds from exercise of stock options	0	64
Distributions to noncontrolling interests in consolidated property partnerships	(6,915)	(7,812)
Dividends and distributions paid to common stockholders and common unitholders	(109,187)	(93,858)
Net cash provided by financing activities	695,287	139,057
Net increase (decrease) in cash and cash equivalents and restricted cash	544,968	(112,319)
Cash and cash equivalents and restricted cash, beginning of period	76,344	171,034
Cash and cash equivalents and restricted cash, end of period	621,312	58,715
Kilroy Realty L.P. [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	69,770	89,009
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of real estate assets and leasing costs	148,419	131,982
Depreciation of non-real estate furniture, fixtures and equipment	6,036	2,405
Revenue reversals (recoveries) for doubtful accounts (Note 8)	12,381	(3,091)
Non-cash amortization of share-based compensation awards	18,311	14,082
Non-cash amortization of deferred financing costs and debt discounts and premiums	1,076	717
Non-cash amortization of net below market rents	(4,500)	(4,415)
Gain on sale of depreciable operating properties	0	(7,169)
Non-cash amortization of deferred revenue related to tenant-funded tenant improvements	(8,793)	(8,181)
Straight-line rents	(33,514)	(29,937)
Amortization of right of use ground lease assets	408	291
Net change in other operating assets	13,991	(15,540)
Net change in other operating liabilities	437	(4,493)
Net cash provided by operating activities	224,022	165,660
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for development properties and undeveloped land	(293,711)	(372,750)
Expenditures for operating properties and other capital assets	(80,630)	(61,557)
Net proceeds received from dispositions	0	17,271
Net cash used in investing activities	(374,341)	(417,036)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from issuance of common stock (Note 4)	721,749	0
Proceeds from the issuance of unsecured debt (Note 3)	350,000	0
Borrowings on unsecured revolving credit facility (Note 3)	190,000	425,000
Repayments on unsecured revolving credit facility (Note 3)	(435,000)	(95,000)
Principal payments and repayments of secured debt (Note 3)	(2,543)	(75,384)
Financing costs	(2,283)	(1,335)
Repurchase of common stock and restricted stock units	(10,534)	(12,618)
Proceeds from exercise of stock options	0	64
Distributions to noncontrolling interests in consolidated property partnerships	(6,915)	(7,812)
Dividends and distributions paid to common stockholders and common unitholders	(109,187)	(93,858)
Net cash provided by financing activities	695,287	139,057
Net increase (decrease) in cash and cash equivalents and restricted cash	544,968	(112,319)
Cash and cash equivalents and restricted cash, beginning of period	76,344	171,034
Cash and cash equivalents and restricted cash, end of period	$ 621,312	$ 58,715