Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Summary Of Restricted Stock Award And Unit Activity) (Details)

v3.3.1.900
Stock-Based Compensation (Summary Of Restricted Stock Award And Unit Activity) (Details) - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Number of Unvested Restricted Shares, beginning of period (shares) 387,245 463,637 245,831
Granted, Number of Unvested Restricted Shares (shares) 352,605 246,409 463,952
Vested, Number of Unvested Restricted Shares (shares) (236,812) (272,665) (237,646)
Forfeited, Number of Unvested Restricted Shares (shares) (18,799) (50,136) (8,500)
Number of Unvested Restricted Shares, end of period (shares) 484,239 387,245 463,637
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Unvested Restricted Shares, Weighted Average Grant Date Fair Value, beginning of period (usd per share) $ 55.87 $ 44.80 $ 31.88
Granted, Weighted Average Grant Date Fair Value (usd per share) 35.99 65.07 50.00
Vested, Weighted Average Grant Date Fair Value (usd per share) 52.39 45.76 41.79
Forfeited, Weighted Average Grant Date Fair Value (usd per share) 45.21 53.72 38.54
Unvested Restricted stock, Weighted Average Grant Date Fair Value, end of period (usd per share) $ 43.51 $ 55.87 $ 44.80