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SHARE-BASED COMPENSATION - Summary of RSU Activity (Details) - Restricted Stock Units (RSUs)
shares in Thousands
6 Months Ended
Jun. 30, 2017
$ / shares
shares
Shares  
Unvested beginning balance (in shares) | shares 600
Granted (in shares) | shares 300
Vested (in shares) | shares (200)
Forfeited (in shares) | shares (15)
Unvested ending balance (in shares) | shares 700
Weighted Average Grant Date Fair Value  
Unvested beginning balance (usd per share) | $ / shares $ 524.17
Granted (usd per share) | $ / shares 722.77
Vested (usd per share) | $ / shares 508.82
Forfeited (usd per share) | $ / shares 597.79
Unvested ending balance (usd per share) | $ / shares $ 611.65