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Stock Based Compensation (Summary Of Non-Vested Stock Award Activity Under Incentive Plan) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock-Based Compensation [Abstract]      
Outstanding, beginning of year, Shares 120 207 205
Outstanding, beginning of year, Grant Date Fair Value $ 218.34 $ 153.40 $ 148.22
Granted, Shares 68 1 6
Granted, Grant Date Fair Value $ 527.45 $ 401.56 $ 272.28
Vested, Shares (117) (83) (3)
Vested, Grant Date Fair Value $ 215.76 $ 55.92 $ 87.36
Forfeited, Shares   (5) (1)
Forfeited, Grant Date Fair Value   $ 267.23 $ 53.36
Outstanding, end of year, Shares 71 120 207
Outstanding, end of year, Grant Date Fair Value $ 520.27 $ 218.34 $ 153.40