SHAREHOLDERS' EQUITY - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Numerator for basic and diluted earnings per share attributable to common stockholders:
Net income attributable to common stockholders	$ 6,148	$ 3,272	$ (4,317)	$ (4,247)	$ 8,073	$ (3,111)	$ (4,689)	$ 25,222	$ (8,564)	$ 20,533	$ (5,292)	$ 17,422	$ 856	$ 25,495	[1]
Denominator:
Basic (in shares)		15,913,975	15,900,316	15,886,493	15,744,233	15,635,953	14,411,940	14,242,076	15,893,443	14,327,477	15,900,362	14,768,429	15,965,631	15,014,385	[1]
Effect of diluted securities (in shares)													200,000,000	200,000,000
Denominator for diluted earnings per share-adjusted weighted average shares and assumed conversions (in shares)		16,113,975	15,900,316	15,886,493	15,944,233	15,635,953	14,411,940	14,442,076	15,893,443	14,527,477	15,900,362	14,968,429	16,165,631	15,214,385	[1]
Basic earnings (loss) per share (in dollars per share)	$ 0.38	$ 0.21	$ (0.27)	$ (0.27)	$ 0.51	$ (0.20)	$ (0.33)	$ 1.77	$ (0.54)	$ 1.43	$ (0.33)	$ 1.18	$ 0.05	$ 1.70	[1]
Diluted earnings (loss) per share (in dollars per share)	$ 0.38	$ 0.20	$ (0.27)	$ (0.27)	$ 0.51	$ (0.20)	$ (0.33)	$ 1.75	$ (0.54)	$ 1.41	$ (0.33)	$ 1.16	$ 0.05	$ 1.68	[1]

[1] * Amounts restated See footnotes 2 and 16 for more information.