SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revised Statement of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 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	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)	$ 16,676	$ 6,679	$ 6,112	$ 4,404	$ 120,792	$ (43,260)	$ 12,661	$ 43,956	$ 34,267	$ 134,518	$ 120,173
Basic earnings per Common Share (in dollars per shares)	$ 0.09	$ 0.04	$ 0.03	$ 0.03	$ 0.68	$ (0.24)	$ 0.07	$ 0.25	$ 0.19	$ 0.75	$ 0.65
Diluted earnings (loss) per Common Share (in dollars per shares)	$ 0.09	$ 0.04	$ 0.03	$ 0.03	$ 0.67	$ (0.24)	$ 0.07	$ 0.24	$ 0.19	$ 0.75	$ 0.65
Prior Period Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)										$ 1,800	$ 700
Earnings per share, basic and diluted (in usd per share)										$ (0.01)
Basic earnings per Common Share (in dollars per shares)											$ (0.01)
Diluted earnings (loss) per Common Share (in dollars per shares)											$ 0