ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) - Schedule of Changes in AOCI By Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 10,352,215	$ 9,976,815
OCI Before Reclassifications		900
Amounts Reclassified from AOCL		6,300
Net OCI		7,200
Ending balance	10,711,734	10,352,215
AOCI Attributable to Parent [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(66,844)	(74,009)
OCI Before Reclassifications	(4,500)
Amounts Reclassified from AOCL	6,000
Net OCI	1,500
Ending balance	(65,282)	(66,844)
Qualified Cash Flow Hedging Instruments [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(10,300)	(12,400)
OCI Before Reclassifications	0	0
Amounts Reclassified from AOCL	2,100	2,100
Net OCI	2,100	2,100
Ending balance	(8,200)	(10,300)
Unrealized Gains/(Losses) on Marketable Securities [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,900)	700
OCI Before Reclassifications	2,300	(2,600)
Amounts Reclassified from AOCL	0	0
Net OCI	2,300	(2,600)
Ending balance	400	(1,900)
Defined Benefit Plans [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(54,600)	(62,300)
OCI Before Reclassifications	(6,800)	3,500
Amounts Reclassified from AOCL	3,900	4,200
Net OCI	(2,900)	7,700
Ending balance	$ (57,500)	$ (54,600)