Pensions and Other Postretirement Benefit Plans (Reconciliation of Level 3 Assets) (Details) (Pension Plans [Member], USD $) In Thousands, unless otherwise specified				12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2011 Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2012 Insurance Contracts [Member]	Dec. 31, 2011 Insurance Contracts [Member]	Dec. 31, 2012 Insurance Contracts [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2011 Insurance Contracts [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2012 Limited Partnerships [Member]	Dec. 31, 2011 Limited Partnerships [Member]	Dec. 31, 2012 Limited Partnerships [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2011 Limited Partnerships [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2012 Hedge Funds [Member]	Dec. 31, 2011 Hedge Funds [Member]	Dec. 31, 2012 Hedge Funds [Member] Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2011 Hedge Funds [Member] Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning of year	$ 173,434	$ 304,658	$ 262,376	$ 11,594	$ 21,864	$ 2,542	$ 2,361	$ 2,361	$ 2,050	$ 7,556	$ 8,676	$ 8,676	$ 9,115	$ 536	$ 557	$ 557	$ 10,699
Net realized (losses)/ gains					88								107				(19)
Net unrealized gains/(losses)				592	188			39	85			521	235			32	(132)
Net purchases, issuances and settlements				(1,552)	226			142	226			(1,641)				(53)
Net transfers (out of) Level 3					(10,772)								(781)				(9,991)
Fair value of plan assets, end of year	$ 173,434	$ 304,658	$ 262,376	$ 10,634	$ 11,594	$ 2,542	$ 2,361	$ 2,542	$ 2,361	$ 7,556	$ 8,676	$ 7,556	$ 8,676	$ 536	$ 557	$ 536	$ 557