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SEGMENT INFORMATION - Schedule of Reconciliation of Operating Earnings from Segment to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Total consolidated operating earnings	$ 281,170	$ 322,587	$ 808,723	$ 945,269
Segment Balances Before Intersegment Eliminations and Consolidation Reconciling Items [Member]
Segment Reporting Information [Line Items]
Total consolidated operating earnings	309,775	352,241	907,363	1,044,454
Eliminations and Unallocated in Consolidation [Member]
Segment Reporting Information [Line Items]
Total consolidated operating earnings	$ (28,605)	$ (29,654)	$ (98,640)	$ (99,185)

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The net result for the period of deducting operating expenses from operating revenues.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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