CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 56,859	$ 40,052	$ 31,612
Other comprehensive income(loss):
Unrealized gain (loss) on derivative contracts	(2,426)	(1,409)
Reclassification of other comprehensive income to interest expense	1,930	1,134
Comprehensive income	56,363	39,777	31,612
Comprehensive income attributable to noncontrolling interests	21,724	17,137	17,323
Comprehensive income attributable to CoreSite Realty Corporation	$ 34,639	$ 22,640	$ 14,289