STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($)			3 Months Ended			9 Months Ended			12 Months Ended		13 Months Ended
	Jun. 16, 2017	Dec. 27, 2016	Sep. 30, 2017		Sep. 30, 2016	Sep. 30, 2017		Sep. 30, 2016	Dec. 31, 2016		Dec. 31, 2016		Dec. 15, 2015	Jul. 25, 2013
Stockholders' Equity Note [Line Items]
Common stock shares into which warrants may be converted (in shares)		3,753,492
Exercise price of warrants, percentage of IPO price														105.00%
Exercise price of warrants (in dollars per share)		$ 13.11												$ 15.75
Common stock, shares authorized (in shares)			450,000,000			450,000,000			450,000,000		450,000,000
Common stock, par value (in dollars per share)			$ 0.01			$ 0.01			$ 0.01		$ 0.01
Common stock, shares issued (in shares)			22,139,258			22,139,258			17,539,258		17,539,258
Common stock, shares outstanding (in shares)			22,139,258			22,139,258			17,539,258		17,539,258
Deficiency dividends		$ 19,384,684	$ 4,201,398		$ 3,508,670	$ 11,214,410		$ 10,517,547
Dividends declared per share of common stock (in dollars per share)		$ 1.33	$ 0.15		$ 0.18	$ 0.45		$ 0.54
Dividend payment, percentage in cash		20.00%
Cash dividends		$ 3,878,042
Dividend payment, percentage in stock		80.00%
Stock dividends		$ 15,506,642
Common stock dividends, shares issued (in shares)		2,936,864
Common stock, shares issued (in dollars per share)		$ 5.28
Proceeds from issuance of common stock	$ 19,800,000					$ 19,827,811		$ 0
Stock repurchase program, authorized amount													$ 10,000,000
Preferred stock, shares authorized (in shares)			50,000,000			50,000,000			50,000,000		50,000,000
Preferred stock, par value (in dollars per share)			$ 0.01			$ 0.01			$ 0.01		$ 0.01
Preferred stock, shares issued (in shares)			1,610,000			1,610,000			1,610,000		1,610,000
Preferred stock, dividend rate, percentage						8.75%			8.75%
Preferred stock, liquidation preference (in dollars per share)			$ 25.00			$ 25.00			$ 25		$ 25
Preferred stock, shares outstanding (in shares)			1,610,000			1,610,000			1,610,000		1,610,000
Dividends payable			$ 29,349	[1]	$ 29,349	$ 29,349	[1]	$ 29,349	$ 39,132	[1]	$ 39,132	[1]
Stock Repurchase Program
Stockholders' Equity Note [Line Items]
Common stock shares repurchased (in shares)						0					126,856
Weighted average share price of common stock repurchased (in dollars per share)											$ 5.09
Stock repurchase program, remaining authorized amount			$ 9,400,000			$ 9,400,000
Series A Preferred Stock
Stockholders' Equity Note [Line Items]
Preferred stock, par value (in dollars per share)			$ 0.01			$ 0.01			$ 0.01		$ 0.01
Preferred stock, dividend rate, percentage						8.75%
Preferred stock, liquidation preference (in dollars per share)			$ 25			$ 25
IPO
Stockholders' Equity Note [Line Items]
Share price (in dollars per share)														$ 15.00
Common Stock
Stockholders' Equity Note [Line Items]
Common stock, shares issued (in dollars per share)	$ 4.60
Issuance of common stock, net (in shares)	4,600,000					4,604,500
Dividends payable			$ 8,582,666			$ 8,582,666
Dividends payable, amount per share (in dollars per share)			$ 0.45			$ 0.45
Common Stock | IPO
Stockholders' Equity Note [Line Items]
Common stock shares into which warrants may be converted (in shares)														3,125,000

[1] Our consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs") as the Company is the primary beneficiary of these VIEs. As of September 30, 2017 and December 31, 2016, assets of consolidated VIEs totaled $1,280,093,874 and $1,369,120,941 respectively, and the liabilities of consolidated VIEs totaled $1,253,353,428 and $1,344,404,080 respectively