Pension and Other Postretirement Benefit Plans (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Components of net periodic benefit cost [Abstract]
Defined benefit plans employer contributions toward sponsored pension plans	$ 2,700,000
Anticipated contribution during current fiscal year	11,300,000
Aggregate contribution towards sponsored pension plans	14,000,000
Pension Benefits [Member]
Components of net periodic benefit cost [Abstract]
Service cost-benefits earned during the period	264,000	286,000
Interest cost on projected benefit obligation	2,654,000	2,624,000
Expected return on plan assets	(3,155,000)	(2,988,000)
Amortization of prior service (credit) cost	11,000	11,000
Amortization of loss	50,000	663,000
Total benefits cost (credited) charged to income	(176,000)	596,000
Other Benefits [Member]
Components of net periodic benefit cost [Abstract]
Service cost-benefits earned during the period	85,000	142,000
Interest cost on projected benefit obligation	876,000	890,000
Expected return on plan assets	0	0
Amortization of prior service (credit) cost	(9,000)	0
Amortization of loss	77,000	26,000
Total benefits cost (credited) charged to income	$ 1,029,000	$ 1,058,000