ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)	$ (7,483,000)	$ (49,106,000)	$ 11,834,000
Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)	$ 0	$ 0	$ 0