CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)	Total	Common Stock [Member]	Common Stock [Member] Common Stock [Member]	Common Stock [Member] Convertible Stock [Member]	Additional Paid- In Capital [Member]	Cumulative Distributions & Net Losses [Member]
Beginning Balance (in shares) at Dec. 31, 2015			76,674,502	1,000
Beginning Balance at Dec. 31, 2015	$ 406,447,523		$ 766,745	$ 10	$ 677,624,840	$ (271,944,072)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)			7,500
Issuance of common stock	0		$ 75		(75)
Transfers to redeemable common stock	(1,000,000)				(1,000,000)
Redemption of common stock (in shares)			(479,140)
Repurchase of common stock	(5,000,000)		$ (4,791)		(4,995,209)
Distributions declared	(54,828,267)					(54,828,267)
Amortization of stock-based compensation	76,285				76,285
Change in value of restricted common stock to Advisor	312,353				312,353
Net income (loss)	(25,579,651)					(25,579,651)
Ending Balance (in shares) at Dec. 31, 2016			76,202,862	1,000
Ending Balance at Dec. 31, 2016	320,428,243		$ 762,029	$ 10	672,018,194	(352,351,990)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)			7,500
Issuance of common stock	(663,896)		$ 75		(75)
Redemption of common stock (in shares)			(730,953)
Repurchase of common stock	(8,000,000)		$ (7,310)		(7,992,690)
Distributions declared	(54,339,823)	$ (54,339,823)				(54,339,823)
Amortization of stock-based compensation	85,486				85,486
Net income (loss)	72,473,867					72,473,867
Ending Balance (in shares) at Dec. 31, 2017			75,479,409	1,000
Ending Balance at Dec. 31, 2017	330,647,773		$ 754,794	$ 10	664,110,915	(334,217,946)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)			7,500
Issuance of common stock	(3,339,202)		$ 75		(75)
Redemption of common stock (in shares)			(836,770)
Repurchase of common stock	(8,000,000)		$ (8,367)		(7,991,633)
Distributions declared	(121,054,857)	$ (121,054,857)				(121,054,857)
Amortization of stock-based compensation	84,866				84,866
Net income (loss)	89,083,552					89,083,552
Ending Balance (in shares) at Dec. 31, 2018			74,650,139	1,000
Ending Balance at Dec. 31, 2018	$ 290,761,334		$ 746,502	$ 10	$ 656,204,073	$ (366,189,251)