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STOCK-BASED COMPENSATION (Summary Of Vested And Unvested Restricted Stock, Performance Stock, and Contract Stock) (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Restricted Stock Awards  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Unvested beginning balance (in shares) | shares 512
Granted (in shares) | shares 286
Cancellations (in shares) | shares (61)
Released (in shares) | shares (286)
Vested but not released (in shares) | shares 0
Unvested ending balance (in shares) | shares 451
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Weighted Average Grant Date Fair Value Per Share, Unvested beginning balance (in dollars per share) | $ / shares $ 28.49
Weighted Average Grant Date Fair Value Per Share, Granted (in dollars per share) | $ / shares 44.15
Weighted Average Grant Date Fair Value Per Share, Cancellations (in dollars per share) | $ / shares 36.00
Weighted Average Grant Date Fair Value Per Share, Released (in dollars per share) | $ / shares 27.89
Weighted Average Grant Date Fair Value Per Share, Vested but not released (in dollars per share) | $ / shares 0.00
Weighted Average Grant Date Fair Value Per Share, Unvested ending balance (in dollars per share) | $ / shares $ 37.79
Performance Stock and Contract Stock Awards  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Unvested beginning balance (in shares) | shares 345
Granted (in shares) | shares 213
Adjustments for performance achievement related to award target (in shares) | shares 25
Cancellations (in shares) | shares (12)
Released (in shares) | shares (225)
Vested but not released (in shares) | shares (174)
Unvested ending balance (in shares) | shares 172
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Weighted Average Grant Date Fair Value Per Share, Unvested beginning balance (in dollars per share) | $ / shares $ 21.62
Weighted Average Grant Date Fair Value Per Share, Granted (in dollars per share) | $ / shares 43.75
Adjustments for performance achievement related to award target (in dollars per share) | $ / shares 36.90
Weighted Average Grant Date Fair Value Per Share, Cancellations (in dollars per share) | $ / shares 30.52
Weighted Average Grant Date Fair Value Per Share, Released (in dollars per share) | $ / shares 43.11
Weighted Average Grant Date Fair Value Per Share, Vested but not released (in dollars per share) | $ / shares 32.40
Weighted Average Grant Date Fair Value Per Share, Unvested ending balance (in dollars per share) | $ / shares $ 33.61