Pension and Post-Retirement Benefit Costs (Additional Information) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Document Fiscal Year Focus	2014
Salaried Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contribution	$ 2,447	$ 776
Expected additional contributions	330
Wage Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contribution	916	640
Expected additional contributions	$ 290