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STOCK-BASED COMPENSATION - Stock Option Activities (Details) - 2007 Incentive Plan - Stock Options
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Number of shares  
Options outstanding, balance at the beginning of the period (in shares) | shares 2,066
Options granted (in shares) | shares 588
Options exercised (in shares) | shares (601)
Options canceled (in shares) | shares (83)
Options outstanding, balance at the end of the period (in shares) | shares 1,970
Weighted Average Exercise Price  
Options outstanding, balance at the beginning of the period (in dollars per share) | $ / shares $ 50.62
Options granted (in dollars per share) | $ / shares 74.13
Options exercised (in dollars per share) | $ / shares 38.52
Options canceled (in dollars per share) | $ / shares 62.66
Options outstanding, balance at the end of the period (in dollars per share) | $ / shares $ 60.82
Other Disclosures  
Options outstanding weighted average remaining contractual life 3 years 5 months
Options outstanding, aggregate intrinsic value | $ $ 30,638
Options exercisable (in shares) | shares 746
Options exercisable (in dollars per share) | $ / shares $ 48.34
Options exercisable, weighted average remaining contractual life 2 years 7 months
Options exercisable, aggregate intrinsic value | $ $ 20,817
Options expected to vest (in shares) | shares 1,202
Options expected to vest (in dollars per share) | $ / shares $ 68.40
Options expected to vest, weighted average remaining contractual life 3 years 9 months
Options expected to vest, aggregate intrinsic value | $ $ 9,690