Stockholders' Equity and Non-controlling Interests - Issuance of shares (Details) $ / shares in Units, $ in Thousands				12 Months Ended
	Nov. 30, 2016 USD ($) $ / shares shares	Sep. 15, 2015 USD ($)	Jul. 21, 2015 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 shares
Shareholders' Equity
Common stock, shares authorized				500,000,000	500,000,000
Common stock, par value (in dollars per share) | $ / shares				$ 0.01	$ 0.01
Common stock, shares issued				33,334,849	17,351,446
Common stock, shares outstanding				33,334,849	17,351,446
Number of fully diluted outstanding shares including OP units and restricted stock (in shares)				38,000,000	23,000,000
Unvested Restricted Stock Awards
Shareholders' Equity
Unvested restricted shares outstanding				277,000	189,000	145,000	214,000
Operating Partnership
Shareholders' Equity
Parent ownership interest (as a percent)				87.60%
Operating Partnership | Common Units
Shareholders' Equity
Parent ownership interest (as a percent)				87.60%
Common stock
Shareholders' Equity
Common stock issued (in shares)					3,100,000	3,360,000
Common stock | Operating Partnership | Common Units
Shareholders' Equity
Ratio for conversion into common shares				1
Non-controlling interest
Shareholders' Equity
Increase (decrease) to non-controlling interest in the Operating Partnership | $				$ 2,692	$ (3,425)	$ (818)
Non-controlling interest | Common Units
Shareholders' Equity
Period after becoming holder of OP Units each limited partner has right to require redemption of units				12 months
Public offering | Common stock
Shareholders' Equity
Common stock, par value (in dollars per share) | $ / shares	$ 0.01
Common stock, shares issued					1,000,000
Common stock issued (in shares)	3,100,000		3,000,000
Common stock, issue price (in dollars per share) | $ / shares	$ 11.25		$ 11.00
Gross proceeds | $	$ 33,300		$ 37,000
Gross proceeds generated from IPO | $		$ 25,000
Aggregate net proceeds after deducting the underwriting discount and commissions and expenses payable | $	$ 32,900	$ 11,000	$ 34,600
Underwritten public offering | Common stock
Shareholders' Equity
Common stock, shares issued	500,000
Threshold days to purchase options	30 days
Common stock issued (in shares)			360,000
Pittman Hough Farms | Operating Partnership | Common Units
Shareholders' Equity
Noncontrolling ownership interest (as a percent)				12.40%
Redeemable Common Units
Shareholders' Equity
OP units outstanding for redemption				3,600,000