Incentive Plans (Schedule Of Stock Options Awards Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercised	(222,000)	(195,000)	(76,000)
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding at beginning of year	467,486
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	(11,085)
Options exercised	(166,474)
Number of Shares, Outstanding and expected to vest at end of year	289,927
Number of Shares, Exercisable at end of year	115,290
Weighted Average Exercise Price, Outstanding at beginning of year	$ 59.63
Weighted Average Exercise Price, Options expired and forfeited	$ 106.90
Weighted Average Exercise Price, Options exercised	$ 29.88
Weighted Average Exercise Price, Outstanding and expected to vest at end of year	$ 74.90
Weighted Average Exercise Price, Exercisable at end of year	$ 26.74
Weighted Average Remaining Contractual Life, Outstanding and expected to vest at end of year	6 years 9 months 19 days
Weighted Average Remaining Contractual Life, Exercisable at end of year	5 years 5 months 24 days
Aggregate Intrinsic Value, Outstanding and expected to vest at end of year	$ 31,651
Aggregate Intrinsic Value, Exercisable at end of year	$ 18,139