Pensions and Other Postretirement Benefit Plans (Reconciliation of Level 3 Assets) (Details) (Pension Plans [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning of year			$ 173,434
Fair value of plan assets, end of year	183,199	168,390	173,434
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning of year	10,301	10,634
Net realized (losses)/ gains	44	94
Net unrealized gains/(losses)	655	589
Net purchases, issuances and settlements	(1,991)	(1,016)
Net transfers (out of) Level 3
Fair value of plan assets, end of year	9,019	10,301
Insurance Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, end of year	2,133	2,875
Insurance Contracts [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning of year	2,875	2,542
Net realized (losses)/ gains
Net unrealized gains/(losses)	49	41
Net purchases, issuances and settlements	(791)	292
Net transfers (out of) Level 3
Fair value of plan assets, end of year	2,133	2,875
Limited Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, end of year	6,522	7,034
Limited Partnerships [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning of year	7,034	7,556
Net realized (losses)/ gains	44	94
Net unrealized gains/(losses)	613	533
Net purchases, issuances and settlements	(1,169)	(1,149)
Net transfers (out of) Level 3
Fair value of plan assets, end of year	6,522	7,034
Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, end of year	364	392
Hedge Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning of year	392	536
Net realized (losses)/ gains
Net unrealized gains/(losses)	3	15
Net purchases, issuances and settlements	(31)	(159)
Net transfers (out of) Level 3
Fair value of plan assets, end of year	$ 364	$ 392