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
Components of net periodic benefit cost
Settlement expense				$ (747)	[1]
Defined pension plan benefits
Components of net periodic benefit cost
Service cost – benefits earned during the year	25	2	32	15
Interest cost on projected benefit obligations	499	440	993	892
Expected return on plan assets	(694)	(684)	(1,407)	(1,379)
Amortization of prior service cost	0	0	0	0
Amortization of net loss	194	218	347	433
Settlement expense	0	747	0	747
Net periodic benefit cost	24	723	(35)	708
Other postretirement benefits
Components of net periodic benefit cost
Service cost – benefits earned during the year	29	42	65	84
Interest cost on projected benefit obligations	62	66	135	132
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	40	40	80	80
Amortization of net loss	0	3	0	6
Settlement expense	0	0	0	0
Net periodic benefit cost	$ 131	$ 151	$ 280	$ 302

[1] These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost (income) in Note 3 "Employee Benefit Plans."