Stock-Based Compensation (Details Of Weighted-Average Grant-Date Fair Values And Assumptions Used For Estimating Fair Values) (Details) - 6 months ended Jun. 30, 2015 - Stock Options [Member] - $ / shares	Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value	$ 8.55
Expected life, in years	6 years
Risk-free interest rate, minimum	1.90%
Risk-free interest rate, maximum	2.10%
Expected volatility, minimum	58.70%
Expected volatility, maximum	80.10%