LEASES - CAPITAL (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Capital Leased Assets [Line Items]
Useful life		50 years
Accumulated depreciation on capital lease	$ 471,222	$ 471,222	$ 440,473
Facilities and equipment
Capital Leased Assets [Line Items]
Interest rate		6.80%
Carrying costs of the capital lease			4,100
Purchase price of respective assets	10,600
Accumulated depreciation on capital lease	$ 200	$ 200	$ 0
Minimum | Facilities and equipment
Capital Leased Assets [Line Items]
Useful life		7 years
Maximum | Facilities and equipment
Capital Leased Assets [Line Items]
Useful life		39 years