Equity - Additional Information (Details) - USD ($)								3 Months Ended
	Apr. 13, 2017	Apr. 06, 2017	Feb. 02, 2017	Jan. 10, 2017	May 04, 2016	Jan. 07, 2016	Jul. 10, 2015	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Class of Stock
Authorized capital shares of common stock (in shares)								500,000,000		500,000,000
Authorized capital shares of preferred stock (in shares)								100,000,000		100,000,000
Common stock, shares issued (in shares)								37,813,127		37,490,361
Common stock, shares outstanding (in shares)								37,813,127		37,490,361
Preferred stock issued (in shares)								0		0
Preferred stock outstanding (in shares)								0		0
Redeemable noncontrolling interest, equity percentage								20.00%
Redeemable noncontrolling interest								$ 2,000,000
Percentage of Operating Partnership held								67.90%		68.10%
Aggregate cash dividends and distributions, paid								$ 9,726,000	$ 7,621,000
Dividends and distributions declared per common share and unit (in dollars per share)			$ 0.19					$ 0.19	$ 0.18
Town Center Phase VI
Class of Stock
Noncontrolling interest ownership percentage in properties				20.00%
Class A units
Class of Stock
Ownership interest percentage in properties								0.00%		0.00%
Class A Units not held by Company (in shares)								16,583,610
Class A units | Town Center Phase VI
Class of Stock
Acquisition, common units/shares issued or to be issued (in shares)				68,691
Class A units | Operating Partnership
Class of Stock
Aggregate cash dividends and distributions, paid						$ 3,000,000
Class A units | Operating Partnership | Subsequent Event
Class of Stock
Aggregate cash dividends and distributions, paid		$ 3,200,000
Class B units | Columbus Village
Class of Stock
Acquisition, common units/shares issued or to be issued (in shares)							1,000,000
Class C units | Columbus Village
Class of Stock
Acquisition, common units/shares issued or to be issued (in shares)							275,000
Common Stock
Class of Stock
Shares issued through public offering (in shares)								248,559
Common stock, shares outstanding (in shares)								37,813,127		37,490,361
Aggregate cash dividends and distributions, paid						$ 6,700,000
Common Stock | Subsequent Event
Class of Stock
Aggregate cash dividends and distributions, paid		$ 7,200,000
New ATM Program | Common Stock
Class of Stock
Maximum aggregate offering price of shares to be sold (up to)					$ 75,000,000.0
New ATM Program | Common Stock | Subsequent Event
Class of Stock
Shares issued through public offering (in shares)	202,131
Numbers shares issued and sold, weighted average price per share (in dollars per share)	$ 13.97
Net proceeds after offering costs and commissions from sale of shares	$ 2,800,000
Prior ATM Program | Common Stock
Class of Stock
Shares issued through public offering (in shares)								248,559
Numbers shares issued and sold, weighted average price per share (in dollars per share)								$ 14.17
Net proceeds after offering costs and commissions from sale of shares								$ 3,400,000