Pension and Other Postretirement Benefits (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Settlement Loss	$ 5,126,000	$ 0	$ 5,126,000	$ 0
Contribution to pension and other postretirement benefit plans			44,800,000
Future contributions to pension and other postretirement benefit plans	1,400,000		1,400,000
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	2,750,000	3,142,000	8,192,000	9,323,000
Interest cost	7,653,000	7,802,000	22,791,000	23,152,000
Expected return on plan assets	(9,469,000)	(8,445,000)	(28,203,000)	(25,058,000)
Recognized actuarial loss	4,887,000	(7,221,000)	18,691,000	4,294,000
Settlement Loss	5,126,000	0	5,126,000	0
Amortization of prior service cost	(1,171,000)	(1,684,000)	(3,488,000)	(4,996,000)
Total net pension cost and postretirement benefit cost	9,776,000	(6,406,000)	23,109,000	6,715,000
Less: Discontinued operations	(1,370,000)	(11,450,000)	54,000	(6,855,000)
Total Pension and Postretirement Costs from Continuing operations	11,146,000	5,044,000	23,055,000	13,570,000
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	463,000	547,000	1,378,000	1,623,000
Interest cost	952,000	1,064,000	2,836,000	3,158,000
Recognized actuarial loss	82,000	75,000	243,000	221,000
Amortization of transition obligation	120,000	167,000	357,000	495,000
Amortization of prior service cost	(37,000)	(52,000)	(110,000)	(153,000)
Total net pension cost and postretirement benefit cost	1,580,000	1,801,000	4,704,000	5,344,000
Less: Discontinued operations	0	399,000	0	1,618,000
Total Pension and Postretirement Costs from Continuing operations	$ 1,580,000	$ 1,402,000	$ 4,704,000	$ 3,726,000