CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares	Jun. 30, 2017	Dec. 31, 2016
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	800,000,000	800,000,000
Common stock, shares issued (in shares)	136,316,192	132,225,488
Common stock, shares outstanding (in shares)	136,316,192	132,225,488
Common stock held in Rabbi Trust (in shares)	63,354	20,181
AMERICAN CAMPUS COMMUNITIES OPERATING PARTNERSHIP, L.P.
General partner, OP units outstanding (in shares)	12,222	12,222
Limited partner, OP units outstanding (in shares)	136,367,324	132,233,447