Retirement Plans (Income (Loss) Estimated to be Amortized from Accumulated Other Comprehensive Income (Loss) into Net Periodic Cost) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Amortization of prior service credits, next twelve months	$ (81)
Amortization of net gain (loss), next twelve months	(2,745)
Total amortization of accumulated other comprehensive income (loss), next twelve months	(2,826)
Pension Plan [Member]
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Amortization of prior service credits, next twelve months	3
Amortization of net gain (loss), next twelve months	(2,576)
Total amortization of accumulated other comprehensive income (loss), next twelve months	(2,573)
Postretirement Plan [Member]
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Amortization of prior service credits, next twelve months	(84)
Amortization of net gain (loss), next twelve months	1
Total amortization of accumulated other comprehensive income (loss), next twelve months	(83)
Supplemental Plan [Member]
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Amortization of prior service credits, next twelve months	0
Amortization of net gain (loss), next twelve months	(170)
Total amortization of accumulated other comprehensive income (loss), next twelve months	$ (170)