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Retirement Plans (Schedule Of Expenses For Pension, Profit-Sharing Plans, Excess Benefit Plans And Other Similar Plans) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Retirement Plans [Abstract]
Defined contribution plans	$ 11,376,000	$ 9,408,000	$ 11,444,000
Number of treasury stock shares held	96,148	97,428
Treasury stock held value	$ 2,100,000	$ 2,000,000

The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

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