CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 106,763	$ 100,491	$ 81,921
Other comprehensive income (loss):
Unrealized gain (loss) on derivative contracts	(3,676)	580	(1,112)
Reclassification of other comprehensive income (loss) to interest expense	(326)	623	1,740
Comprehensive income	102,761	101,694	82,549
Comprehensive income attributable to noncontrolling interests	27,912	25,985	23,242
Comprehensive income attributable to CoreSite Realty Corporation	$ 74,849	$ 75,709	$ 59,307