DEBT - Narrative (Details) - USD ($)		3 Months Ended
	May. 05, 2015	Mar. 31, 2016	Dec. 31, 2015
Senior Credit Facility, 2015
Line of Credit Facility [Line Items]
Current borrowing capacity	$ 500,000,000
Interest rate, effective percentage (percent)		1.94%
Debt issuance costs	$ 1,000,000
Line of credit term (years)	5 years
Senior Credit Facility, 2015 | Minimum
Line of Credit Facility [Line Items]
Commitment fee percentage (percent)		0.20%
Senior Credit Facility, 2015 | Maximum
Line of Credit Facility [Line Items]
Commitment fee percentage (percent)		0.40%
Senior Credit Facility, 2015 | Federal Funds rate
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)	0.50%
Senior Credit Facility, 2015 | Monthly Libor Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Basis spread on variable rate (percent)	1.00%
Senior Credit Facility, 2015 | Unsecured Debt
Line of Credit Facility [Line Items]
Current borrowing capacity	$ 300,000,000
Long-term line of credit		$ 300,000,000	$ 300,000,000
Senior Credit Facility, 2015 | Revolving Credit Facility
Line of Credit Facility [Line Items]
Current borrowing capacity	200,000,000
Additional borrowing capacity (up to)	100,000,000
Senior Credit Facility, 2013 | Revolving Credit Facility
Line of Credit Facility [Line Items]
Long-term line of credit	$ 0