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STOCKHOLDERS' EQUITY - Share Repurchase Activities (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Equity [Abstract]          
Shares repurchased 0 0 16,000 2,400,000 0
Average price per share (in dollars per share)         $ 516.54
Value of shares repurchased         $ 8.1