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Stockholders' Equity and Non-controlling Interests - Redeemable non-controlling interest (Details) - USD ($) $ / shares in Units, $ in Thousands																												12 Months Ended
	Feb. 27, 2020	Jan. 15, 2020	Nov. 11, 2019	Oct. 15, 2019	Aug. 06, 2019	Jul. 15, 2019	May 08, 2019	Apr. 15, 2019	Feb. 07, 2019	Jan. 15, 2019	Nov. 05, 2018	Oct. 15, 2018	Aug. 08, 2018	Jul. 16, 2018	May 01, 2018	Apr. 16, 2018	Feb. 13, 2018	Jan. 16, 2018	Nov. 08, 2017	Oct. 13, 2017	Aug. 17, 2017	Jul. 19, 2017	Jul. 14, 2017	May 08, 2017	Apr. 14, 2017	Feb. 22, 2017	Mar. 02, 2016	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in redeemable non-controlling interest
Opening balance																												$ 120,510
Ending balance																												120,510	$ 120,510
Series B Participating Preferred Stock, $0.01 par value, 6,037,500 shares authorized; 5,972,059 shares issued and outstanding at December 31, 2019, and 6,013,587 shares issued and outstanding at December 31, 2018																												$ 142,861	143,758
USDA FVA annual adjustment amount per share of Series B Participating Preferred Stock																												$ 0.69
Series B Participating Preferred Stock																												$ 142,861	$ 143,758
Dividend paid (in dollars per share)		$ 0.0500		$ 0.0500		$ 0.0500		$ 0.0500		$ 0.0500		$ 0.0500		$ 0.1275		$ 0.1275		$ 0.1275		$ 0.1275			$ 0.1275		$ 0.1275			$ 0.2000	$ 0.3550	$ 0.5100
Distributions declared per common share			$ 0.0500		$ 0.0500		$ 0.0500		$ 0.0500		$ 0.0500		$ 0.0500		$ 0.1275		$ 0.1275		$ 0.1275			$ 0.1275		$ 0.1275		$ 0.1275		$ 0.2000	$ 0.3550	$ 0.5100
Repayment of principal																												$ 11,385	$ 11,508	$ 81,219
Percent of dividend distributed - ordinary income																												2.00%	13.00%	52.00%
Redeemable Preferred OP Units \| Preferred Share
Change in redeemable non-controlling interest
Opening balance																												$ 120,510	$ 120,510
Opening balance (in shares)																												117,000	117,000
Distributions paid to non-controlling interest																												$ (3,510)	$ (3,510)
Accrued distributions to non-controlling interest																												3,510	3,510
Ending balance																												$ 120,510	$ 120,510	$ 120,510
Ending balance (in shares)																												117,000	117,000	117,000
Series A Preferred Units
Stockholders’ Equity and Non-controlling Interests
Ratio of OP units redeemable into common stock																												1
Change in redeemable non-controlling interest
Accrued distributions to non-controlling interest																												$ (3,510)	$ (3,510)	$ (3,510)
Percentage of preferential cash distribution																											3.00%
Liquidation preference																											$ 1,000
Number of trading days																												20 days
Percentage of cumulative preferential dividends																												3.00%
Distributions payable																												$ 3,500
Series A Preferred Units \| Forsythe \| Asset acquisition
Stockholders’ Equity and Non-controlling Interests
Issuance of Common units as partial consideration for asset acquisition (in shares)																											100,000
Change in redeemable non-controlling interest
Liquidation value																												120,500	120,500
Series B Participating Preferred Stock
Change in redeemable non-controlling interest
Accrued distributions to non-controlling interest																												(8,975)	(9,053)	$ (3,346)
Declaration of dividend on Series B Participating Preferred Stock																												$ 9,000	$ 9,100
Percentage of cumulative change in the estimated value of farmland																					50.00%
Final liquidation preference, percentage cap on total return																					9.00%
Number of preceding years considered in redemption price calculation																												4 years
Constant percentage																												50.00%
Shares issued under underwriting agreement																					6,037,500
Preference dividend (as a percent)																					6.00%
Par value																					$ 0.01
Common stock, issue price (in dollars per share)																					25.00
Liquidation preference																					$ 25
Series B Participating Preferred Stock \| Subsequent event
Change in redeemable non-controlling interest
Preference dividend (as a percent)	6.00%