Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Pension Benefits [Member]
Components of net periodic cost (benefit) for pension and postretirement plans
Service cost	$ 57	$ 50	$ 114	$ 99
Interest cost	242	220	485	441
Expected return on plan assets	(313)	(278)	(626)	(557)
Defined Benefit Plan Amortization Of Actuarial Loss Gain And Prior Service Cost Credit	70	194	139	388
Net periodic cost recognized	56	186	112	371
Postretirement Benefits [Member]
Components of net periodic cost (benefit) for pension and postretirement plans
Service cost	0	1	0	1
Interest cost	1	1	2	2
Defined Benefit Plan Amortization Of Actuarial Loss Gain And Prior Service Cost Credit	(15)	(117)	(29)	(234)
Net periodic cost recognized	$ (14)	$ (115)	$ (27)	$ (231)