Annual report pursuant to Section 13 and 15(d)

Share Based Compensation (Schedule Of Share-based Compensation, Restricted Stock And Restricted Stock Units Activity) (Details)

v3.8.0.1
Share Based Compensation (Schedule Of Share-based Compensation, Restricted Stock And Restricted Stock Units Activity) (Details) - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Nonvested as of December 31 0 380,812
Granted 153,100  
Vested (531,468)  
Forfeited 2,444  
Weighted Average Grant Price Nonvested $ 0 $ 67.92
Granted Weighted Average Grant Price 63.6  
Vested Weighted Average Grant Price 49.14  
Forfeited Weighted Average Grant Price $ 43.99