FAIR VALUE MEASUREMENTS Assets and Liabilities Measured at Fair Value Subject to Three-Tier Hierarchy (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring Basis
Fair value, level transfers	$ 0	$ 0
Recurring Basis | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis
Total - asset	55,000,000	43,000,000
Recurring Basis | Fair Value, Inputs, Level 1 | Fixed Income Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis
Mutual funds	54,000,000	42,000,000
Recurring Basis | Fair Value, Inputs, Level 1 | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis
Mutual funds	1,000,000	1,000,000
Recurring Basis | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis
Total - net liability	$ 4,000,000	8,000,000
Recurring Basis | Fair Value, Inputs, Level 2 | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring Basis
Interest rate swap fair value, asset		$ 8,000,000