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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, 2016
$ / 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 588
Granted (in shares) | shares 289
Cancellations (in shares) | shares (52)
Released (in shares) | shares (313)
Vested but not released (in shares) | shares 0
Unvested ending balance (in shares) | shares 512
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 $ 24.10
Weighted Average Grant Date Fair Value Per Share, Granted (in dollars per share) | $ / shares 33.71
Weighted Average Grant Date Fair Value Per Share, Cancellations (in dollars per share) | $ / shares 27.83
Weighted Average Grant Date Fair Value Per Share, Released (in dollars per share) | $ / shares 22.09
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 $ 28.49
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 332
Granted (in shares) | shares 203
Adjustments for performance achievement related to award target (in shares) | shares 25
Cancellations (in shares) | shares (12)
Released (in shares) | shares (15)
Vested but not released (in shares) | shares (188)
Unvested ending balance (in shares) | shares 345
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 $ 16.65
Weighted Average Grant Date Fair Value Per Share, Granted (in dollars per share) | $ / shares 32.70
Adjustments for performance achievement related to award target (in dollars per share) | $ / shares 31.07
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 25.03
Weighted Average Grant Date Fair Value Per Share, Vested but not released (in dollars per share) | $ / shares 25.23
Weighted Average Grant Date Fair Value Per Share, Unvested ending balance (in dollars per share) | $ / shares $ 21.62