Pensions and Other Postretirement Benefit Plans (Reconciliation of Level 3 Assets) (Details) - Pension Plans [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning of year	$ 171,387	$ 183,199
Fair value of plan assets, end of year	180,672	171,387
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning of year	2,403	2,133
Net realized gains/(losses)
Net unrealized gains/(losses)	26	35
Net purchases, issuances and settlements	(191)	235
Net transfers (out of) Level 3
Fair value of plan assets, end of year	2,238	2,403
Insurance Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning of year	2,403
Fair value of plan assets, end of year	2,238	2,403
Insurance Contracts [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning of year	2,403	2,133
Net realized gains/(losses)
Net unrealized gains/(losses)	26	35
Net purchases, issuances and settlements	(191)	235
Net transfers (out of) Level 3
Fair value of plan assets, end of year	$ 2,238	$ 2,403