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STOCK-BASED COMPENSATION - Restricted Stock and Restricted Stock Units Activity (Details) - 2007 Incentive Plan - Restricted Stock and Restricted Stock Units
shares in Thousands
 12 Months Ended
Dec. 31, 2016
$ / shares
shares
Restricted Stock and Restricted Stock Units  
Balance at the beginning of the period (in shares) | shares 607
Granted (in shares) | shares 236
Vested (in shares) | shares (296)
Canceled (in shares) | shares (32)
Balance at the end of the period (in shares) | shares 515
Weighted Average Grant Date Fair Value  
Balance at the beginning of the period (in dollars per share) | $ / shares $ 55.52
Granted (in dollars per share) | $ / shares 75.10
Vested (in dollars per share) | $ / shares 49.29
Canceled (in dollars per share) | $ / shares 63.36
Balance at the end of the period (in dollars per share) | $ / shares $ 67.62