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Stock Based Compensation (Summary Of Non-Vested Stock Award Activity Under Incentive Plan) (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock-Based Compensation [Abstract]      
Outstanding, beginning of year, Shares 70 71 120
Outstanding, beginning of year, Grant Date Fair Value $ 525.60 $ 520.27 $ 218.34
Shares granted 47 2 68
Granted, Grant Date Fair Value $ 785.32 $ 495.92 $ 527.45
Vested, Shares (1) (2) (117)
Vested, Grant Date Fair Value $ 413.07 $ 284.11 $ 215.76
Forfeited, Shares 0 (1) 0
Forfeited, Grant Date Fair Value $ 534.55 $ 410.55 $ 0.00
Outstanding, end of year, Shares 116 70 71
Outstanding, end of year, Grant Date Fair Value $ 511.88 $ 525.60 $ 520.27