Pension (Components Of Net Periodic Benefit Cost) (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 0	$ 1,055,000	$ 0	$ 3,721,000
Interest Cost	1,923,000	1,835,000	5,768,000	5,423,000
Expected Return On Plan Assets	(2,336,000)	(2,267,000)	(7,009,000)	(7,091,000)
Amortization Of Prior Service Cost	0	6,000	0	19,000
Amortization Of Transition Obligation	0	0	0	0
Amortization Of Net Actuarial Loss	120,000	884,000	361,000	2,398,000
Net Periodic Postretirement Benefit Cost	(293,000)	1,513,000	(880,000)	4,470,000
Estimated Contributions, Next Fiscal Year			559,000
Contributions			419,000
Estimated Contributions, Current Fiscal Year			140,000
SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	108,000	69,000	251,000	695,000
Interest Cost	133,000	100,000	378,000	304,000
Expected Return On Plan Assets	0	0	0	0
Amortization Of Prior Service Cost	57,000	54,000	130,000	163,000
Amortization Of Transition Obligation	0	0	0	0
Amortization Of Net Actuarial Loss	41,000	52,000	98,000	165,000
Net Periodic Postretirement Benefit Cost	339,000	275,000	857,000	1,327,000
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	317,000	337,000	950,000	1,012,000
Interest Cost	246,000	217,000	739,000	651,000
Expected Return On Plan Assets	0	0	0	0
Amortization Of Prior Service Cost	29,000	29,000	86,000	86,000
Amortization Of Transition Obligation	0	2,000	0	6,000
Amortization Of Net Actuarial Loss	0	42,000	0	126,000
Net Periodic Postretirement Benefit Cost	592,000	627,000	1,775,000	1,881,000
Estimated Contributions, Next Fiscal Year			782,000
Contributions			587,000
Estimated Contributions, Current Fiscal Year			$ 195,000