Employee Benefit Plans (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 Benefits [Member]
Components of net periodic cost (benefit) for pension and postretirement plans
Service cost	$ 56	$ 49	$ 170	$ 148
Interest cost	243	221	728	662
Expected return on plan assets	(313)	(279)	(939)	(836)
Defined Benefit Plan Amortization Of Actuarial Loss Gain And Prior Service Cost Credit	69	194	208	582
Net periodic cost recognized	55	185	167	556
Postretirement Benefits [Member]
Components of net periodic cost (benefit) for pension and postretirement plans
Service cost	0	0	0	1
Interest cost	0	1	2	3
Defined Benefit Plan Amortization Of Actuarial Loss Gain And Prior Service Cost Credit	(14)	(117)	(43)	(351)
Net periodic cost recognized	$ (14)	$ (116)	$ (41)	$ (347)