Stockholders' Equity and Non-controlling Interests - Distributions (Details) $ / shares in Units, $ in Thousands							3 Months Ended	9 Months Ended
	Oct. 31, 2017 shares	Jul. 19, 2017 shares	Jul. 10, 2017 shares	Apr. 12, 2017 shares	Mar. 27, 2017 shares	Jun. 02, 2016	Dec. 31, 2017 $ / shares shares	Sep. 30, 2017 USD ($) shares	Sep. 30, 2016 USD ($)	Dec. 31, 2016 shares	Jun. 02, 2015 shares
Common units
Shareholders' Equity
OP units outstanding for redemption								4,500,000		3,000,000
Subsequent event
Shareholders' Equity
Shares repurchased (in shares)							279,210
Shares repurchased, average price (in dollars per share) | $ / shares							$ 9.15
Subsequent event | Common units
Shareholders' Equity
Shares repurchased (in shares)	984,365
Operating Partnership
Shareholders' Equity
Parent ownership interest (as a percent)								85.10%		75.10%
Common stock
Shareholders' Equity
Common stock issued (in shares)		531,827	118,634	328,122	129,174
Shares repurchased (in shares)		531,827	118,634	328,122	129,174
OP units outstanding for redemption											1,993,709
Common stock | Subsequent event
Shareholders' Equity
Common stock issued (in shares)	984,365
Common stock | Operating Partnership
Shareholders' Equity
Ratio for conversion into common shares						1
Non-controlling interest
Shareholders' Equity
Increase of non-controlling interests and decrease of additional paid in capital | $								$ 3,101	$ (4,282)
Non-controlling interest | Operating Partnership
Shareholders' Equity
Increase of non-controlling interests and decrease of additional paid in capital | $								$ 3,100	$ 4,300
Pittman Hough Farms | Operating Partnership
Shareholders' Equity
Noncontrolling ownership interest (as a percent)								14.90%		24.90%