Pension and Post-Retirement Benefit Costs (Components of Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 331	$ 275	$ 498	$ 815
Interest cost	1,138	515	2,309	1,531
Expected return on plan assets	(777)	(713)	(2,363)	(2,140)
Amortization of prior service cost	74	74	223	223
Amortization of net loss	71	510	204	1,449
Net periodic benefit cost	837	661	871	1,878
Post-Retirement Healthcare
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	2	16	7
Interest cost	185	147	548	442
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	13	21	38	63
Amortization of net loss	82	90	220	269
Net periodic benefit cost	$ 286	$ 260	$ 822	$ 781