Post-retirement Plan (Net Periodic Pension Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefit earned during the period	$ 424	$ 224	$ 848	$ 448
Interest cost on projected benefit obligations	205	160	410	319
Amortization of prior service cost	(871)	(1,074)	(1,742)	(2,148)
Amortization of net loss	46	0	92	0
Net periodic post-retirement expense (credit)	$ (196)	$ (690)	$ (392)	$ (1,381)