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Stock-Based And Long-Term Compensation (Summary Of The Valuation Assumptions Used To Calculate The Fair Value Of Stock Option Grants) (Details) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Weighted average fair value of grants $ 6.25 $ 6.95 $ 8.98
Black-Scholes-Merton Assumptions:      
Risk free interest rate 1.33% 1.42% 0.63%
Expected life (years) 5 years 4 years 4 years
Volatility 47.07% 34.50% 48.41%
Dividend yield 1.30% 1.23%