ACCUMULATED OTHER COMPREHENSIVE INCOME - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)	$ 5,140,000	$ (40,847,000)	$ (598,000)	$ (71,095,000)
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)			$ 0	$ 0