Pension and Other Post-Retirement Benefit Plans (Net Periodic Benefit Costs) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pension Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 0	$ 0
Interest cost	9,879,000	8,989,000
Expected return on plan assets	(11,528,000)	(11,498,000)
Amortization of prior service cost	0	0
Amortization of net (gain) loss	(1,000)	3,074,000
Net periodic benefit cost	(1,650,000)	565,000
Employer contributions	705,000
Estimated future employer contributions	5,600,000
Post-Retirement Healthcare Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	60,000	69,000
Interest cost	71,000	66,000
Expected return on plan assets	0	0
Amortization of prior service cost	(872,000)	(1,414,000)
Amortization of net (gain) loss	80,000	105,000
Net periodic benefit cost	$ (661,000)	$ (1,174,000)