ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)	$ (3,985,000)	$ (25,860,000)
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)	$ 0	$ 0