CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 14,530	$ 8,990	$ 39,472	$ 27,746
Other comprehensive income(loss):
Unrealized gain (loss) on derivative contracts	(2,947)	397	(3,807)	(357)
Reclassification of other comprehensive income to interest expense	567	340	1,371	795
Comprehensive income	12,150	9,727	37,036	28,184
Comprehensive income attributable to noncontrolling interests	4,469	4,160	15,016	11,968
Comprehensive income attributable to CoreSite Realty Corporation	$ 7,681	$ 5,567	$ 22,020	$ 16,216