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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, 2018
$ / 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 451
Granted (in shares) | shares 261
Cancellations (in shares) | shares (56)
Released (in shares) | shares (239)
Vested but not released (in shares) | shares 0
Unvested ending balance (in shares) | shares 417
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 $ 37.79
Weighted Average Grant Date Fair Value Per Share, Granted (in dollars per share) | $ / shares 56.77
Weighted Average Grant Date Fair Value Per Share, Cancellations (in dollars per share) | $ / shares 45.51
Weighted Average Grant Date Fair Value Per Share, Released (in dollars per share) | $ / shares 37.13
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 $ 48.97
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 172
Granted (in shares) | shares 164
Adjustments for performance achievement related to award target (in shares) | shares 40
Cancellations (in shares) | shares (14)
Released (in shares) | shares (203)
Vested but not released (in shares) | shares (74)
Unvested ending balance (in shares) | shares 85
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 $ 33.61
Weighted Average Grant Date Fair Value Per Share, Granted (in dollars per share) | $ / shares 56.23
Adjustments for performance achievement related to award target (in dollars per share) | $ / shares 21.42
Weighted Average Grant Date Fair Value Per Share, Cancellations (in dollars per share) | $ / shares 0.00
Weighted Average Grant Date Fair Value Per Share, Released (in dollars per share) | $ / shares 55.81
Weighted Average Grant Date Fair Value Per Share, Vested but not released (in dollars per share) | $ / shares 42.94
Weighted Average Grant Date Fair Value Per Share, Unvested ending balance (in dollars per share) | $ / shares $ 45.56