Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
REVENUES:
Revenues	$ 747,298	$ 719,001	$ 642,572
EXPENSES:
Real estate taxes	70,820	66,449	55,206
Provision for bad debts	5,685	3,269	0
Ground leases	6,176	6,337	3,439
General and administrative expenses	90,471	60,581	57,029
Acquisition-related expenses	0	0	1,902
Depreciation and amortization	254,281	245,886	217,234
Total expenses	561,220	512,493	448,742
OTHER (EXPENSES) INCOME:
Interest income and other net investment gain/loss	(559)	5,503	1,764
Interest expense	(49,721)	(66,040)	(55,803)
Loss on early extinguishment of debt	(12,623)	(5,312)	0
Net gain (loss) on sales of land	11,825	449	(295)
Gains on sales of depreciable operating properties	142,926	39,507	164,302
Total other income (expenses)	91,848	(25,893)	109,968
NET INCOME	277,926	180,615	303,798
Net income attributable to noncontrolling common units of the Operating Partnership	(5,193)	(3,223)	(6,635)
Net income attributable to noncontrolling interests in consolidated property partnerships	(14,318)	(12,780)	(3,375)
Total income attributable to noncontrolling interests	(19,511)	(16,003)	(10,010)
NET INCOME ATTRIBUTABLE TO KILROY REALTY CORPORATION / KILROY REALTY, L.P.	258,415	164,612	293,788
Preferred dividends	0	(5,774)	(13,250)
Original issuance costs of redeemed preferred stock and preferred units	0	(7,589)	0
Total preferred dividends	0	(13,363)	(13,250)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS/UNITHOLDERS	$ 258,415	$ 151,249	$ 280,538
Net income available to common stockholders per share - basic (in dollars per share)	$ 2.56	$ 1.52	$ 3.00
Net income available to common stockholders per share - diluted (in dollars per share)	$ 2.55	$ 1.51	$ 2.97
Weighted average shares of common stock outstanding – basic (in shares)	99,972,359	98,113,561	92,342,483
Weighted average shares of common stock outstanding – diluted (in shares)	100,482,365	98,727,331	93,023,034
Rental [Member]
REVENUES:
Revenues	$ 656,631	$ 633,896	$ 574,413
Tenant reimbursements [Member]
REVENUES:
Revenues	80,982	76,559	61,079
Other property income [Member]
REVENUES:
Revenues	9,685	8,546	7,080
Real estate [Member]
EXPENSES:
Property expenses	$ 133,787	$ 129,971	$ 113,932