CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues
Rental income	$ 51,707	$ 35,710	$ 148,760	$ 109,486
Expense reimbursements	9,957	7,192	32,347	22,920
Other	1,014	953	3,074	3,412
Total revenues	62,678	43,855	184,181	135,818
Operating expenses
Depreciation and amortization	26,652	15,217	77,245	46,744
General and administrative	7,953	12,869	25,286	30,742
Real estate taxes	8,822	6,195	27,462	18,000
Property operating	9,417	5,055	26,978	15,697
Other operating	250	3,265	987	4,094
Impairment of an asset	3,840	0	3,840	0
Total operating expenses	56,934	42,601	161,798	115,277
Operating income	5,744	1,254	22,383	20,541
Equity in earnings (losses) and gains (losses) of unconsolidated affiliates inclusive of gains (losses) on disposition of properties of $0, ($726), $14,771 and ($726), respectively	4,001	(102)	21,044	3,592
Interest income	6,461	7,245	23,648	19,298
Interest expense	(15,428)	(7,982)	(39,666)	(24,917)
Income from continuing operations before income taxes	778	415	27,409	18,514
Income tax provision	(465)	(89)	(1,017)	(123)
Income from continuing operations before gain on disposition of properties	313	326	26,392	18,391
Gain on disposition of properties, net of tax	12,972	0	12,972	81,965
Net income	13,285	326	39,364	100,356
Net loss (income) attributable to noncontrolling interests	(418)	5,786	1,194	(47,401)
Net income attributable to Acadia	$ 12,867	$ 6,112	$ 40,558	$ 52,955
Earnings Per Share, Basic and Diluted [Abstract]
Basic and diluted earnings per share (in dollars per share)	$ 0.15	$ 0.08	$ 0.48	$ 0.71