EMPLOYEE STOCK BENEFIT PLANS - Summary of Performance Share Awards Activity (Details) shares in Thousands	12 Months Ended
Dec. 31, 2015 $ / shares shares	Dec. 31, 2014 $ / shares shares	Dec. 31, 2013 $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares Granted and Earned (in thousands)	148	157	176
Weighted- Average Grant- Date Fair Value \| $ / shares	100.99	78.65	72.24
Performance Shares Outstanding at December 31, 2015 (in thousands)	0	124	67

The weighted average fair value of outstanding awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

No definition available.

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