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Stock-Based And Long-Term Compensation (Summary Of Non-Vested Stock Option Activity) (Details)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Dec. 31, 2014
$ / shares
Summarizes Non-vested Stock Option [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares, Beginning Balance | shares 1,102,879    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares 2,121,417    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares | shares (594,883)    
Number of options forfeited | shares (289,820)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares, Ending Balance | shares 2,339,593 1,102,879  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Exercise Price, Beginning Balance $ 20.81    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value 3.61 $ 6.25 $ 6.95
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value $ 21.54    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Granted, Weighted Average Grant Date Fair Value 9.76    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value $ 9.76    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Exercise Price, Ending Balance $ 11.97 $ 20.81