ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)	$ (1,753,000)	$ (4,388,000)	$ (5,738,000)	$ (30,248,000)
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)			$ 0	$ 0