Pension And Postretirement Benefit Costs (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected contribution by the employer		$ 2,470,000
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected contribution by the employer	1,350,000	1,630,000
Total contribution by the employer	$ 280,000