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SEGMENT INFORMATION - Schedule of Reconciliation of Operating Earnings from Segment to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Total consolidated operating earnings	$ 305,589	$ 356,717	$ 622,681	$ 707,965
Segment Balances Before Intersegment Eliminations and Consolidation Reconciling Items [Member]
Segment Reporting Information [Line Items]
Total consolidated operating earnings	350,921	394,190	692,215	779,192
Eliminations and Unallocated in Consolidation [Member]
Segment Reporting Information [Line Items]
Total consolidated operating earnings	$ (45,332)	$ (37,473)	$ (69,534)	$ (71,227)

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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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