Pension and Other Post-Retirement Benefits (Pretax Amounts Included in Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Prior service cost (credit)	$ 0	$ 0
Net actuarial loss	285,132	202,404
Accumulated other comprehensive loss (income)	285,132	202,404
Other Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Prior service cost (credit)	(1,402)	(1,506)
Net actuarial loss	698	440
Accumulated other comprehensive loss (income)	$ (704)	$ (1,066)