Retirement Plan (Net Periodic Pension Expense) (Details) (Other Post-Retirement Healthcare and Other Benefits Plan [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Other Post-Retirement Healthcare and Other Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefit earned during the period	$ 224	$ 278
Interest cost on projected benefit obligations	159	159
Amortization of prior service cost	(1,074)	(1,474)
Amortization of net loss	0	31
Loss on settlement	0	1,726
Net periodic post-retirement expense (credit)	$ (691)	$ 720