RELATED PARTY TRANSACTIONS - Additional Information (Details)		12 Months Ended
	Mar. 27, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Ratio of percentage of stockholders' equity paid up to predetermined amount	0.0875
Ratio of percentage of stockholders' equity paid over predetermined amount	0.0075
Predetermined amount of stockholders equity used in calculating monthly management fee	$ 17,280,000,000
Compensation and management fee		$ 170,628,000	$ 179,841,000	$ 164,322,000
Ratio of independent directors or holders of a majority of the outstanding shares		0.0067
Management Agreement
Compensation and management fee		$ 170,600,000	179,800,000	164,300,000
Reimbursement payments		21,400,000	9,200,000	0
Management fee payable		$ 15,800,000	16,000,000.0
Renewal term		2 years
Accelerated period for agreement termination, if election to terminate is not made		90 days
Management Agreement | Minimum
Accelerated period for agreement termination, if election to terminate is made		7 days
Management Agreement | Maximum
Accelerated period for agreement termination, if election to terminate is made		90 days
Subsidiaries | Management Agreement
Compensation expense		$ 5,900,000	$ 5,200,000	$ 7,200,000