Pensions and Other Postretirement Benefit Plans (Details) (USD $)	3 Months Ended		9 Months Ended						3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Pension Plans [Member]	Sep. 30, 2012 Pension Plans [Member]	Sep. 30, 2013 Other Postretirement Benefits [Member]	Sep. 30, 2012 Other Postretirement Benefits [Member]	Sep. 30, 2013 Defined Benefit Postretirement Life Insurance [Member]	Dec. 31, 2012 Defined Benefit Postretirement Life Insurance [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost					$ 2,526,000	$ 54,000	$ 789,000	$ 804,000
Interest cost					5,999,000	9,824,000	2,374,000	2,766,000
Expected return on assets					(6,103,000)	(9,436,000)
Amortization of prior service cost/(credit)					27,000	339,000	(2,818,000)	(2,751,000)
Amortization of transition obligation					51,000	59,000
Amortization of net actuarial loss					2,357,000	3,774,000	2,606,000	2,412,000
Settlement				119,735,000	315,000	119,735,000
Net periodic benefit cost					5,172,000	124,349,000	2,951,000	3,231,000
Plan modification, effect on liabilities									(8,000,000)
Plan modification, effect on expense									(200,000)
Actuarial assumptions, discount rate									4.85%	3.93%
Plan remeasurement, effect on liabilities									$ 14,400,000