Pension (Components Of Net Periodic Benefit Cost) (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 0	$ 1,333,000	$ 0	$ 2,666,000
Interest Cost	1,922,000	1,794,000	3,845,000	3,588,000
Expected Return On Plan Assets	(2,337,000)	(2,412,000)	(4,673,000)	(4,823,000)
Amortization Of Prior Service Cost	0	6,000	0	12,000
Amortization Of Transition Obligation	0	0	0	0
Amortization Of Net Actuarial Loss	121,000	757,000	241,000	1,514,000
Net Periodic Postretirement Benefit Cost	(294,000)	1,478,000	(587,000)	2,957,000
Estimated Contributions, Next Fiscal Year			559,000
Contributions			280,000
Estimated Contributions, Current Fiscal Year			279,000
SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	71,000	313,000	143,000	626,000
Interest Cost	122,000	102,000	245,000	204,000
Expected Return On Plan Assets	0	0	0	0
Amortization Of Prior Service Cost	37,000	54,000	73,000	109,000
Amortization Of Transition Obligation	0	0	0	0
Amortization Of Net Actuarial Loss	29,000	57,000	57,000	113,000
Net Periodic Postretirement Benefit Cost	259,000	526,000	518,000	1,052,000
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	316,000	337,000	633,000	674,000
Interest Cost	247,000	217,000	493,000	434,000
Expected Return On Plan Assets	0	0	0	0
Amortization Of Prior Service Cost	28,000	29,000	57,000	58,000
Amortization Of Transition Obligation	0	2,000	0	4,000
Amortization Of Net Actuarial Loss	0	42,000	0	84,000
Net Periodic Postretirement Benefit Cost	591,000	627,000	1,183,000	1,254,000
Estimated Contributions, Next Fiscal Year			782,000
Contributions			391,000
Estimated Contributions, Current Fiscal Year			$ 391,000