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
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, before Tax			$ (121)	[1]	$ (120)	[1]
Components of net periodic benefit cost
Settlement expense			(680)	[1]	(793)	[1]
Defined pension plan benefits
Components of net periodic benefit cost
Service cost – benefits earned during the year	15	7	47		22
Interest cost on projected benefit obligations	496	491	1,489		1,383
Expected return on plan assets	(703)	(678)	(2,110)		(2,057)
Amortization of prior service cost	0	0	0		0
Amortization of net loss	174	180	521		613
Settlement expense	680	46	680		793
Net periodic benefit cost	662	46	627		754
Other postretirement benefits
Components of net periodic benefit cost
Service cost – benefits earned during the year	32	32	97		116
Interest cost on projected benefit obligations	67	60	202		192
Expected return on plan assets	0	0	0		0
Amortization of prior service cost	41	34	121		120
Amortization of net loss	0	0	0		0
Settlement expense	0	0	0		0
Net periodic benefit cost	$ 140	$ 126	$ 420		$ 428

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