Post-retirement Plan (Net Periodic Pension Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		5 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 944		$ 1,582
Interest cost on projected benefit obligations	518		868
Expected Return on Plan Assets	(747)		(1,252)
Pension Cost (Reversal of Cost)	715		$ 1,198
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	301	$ 324		$ 601	$ 648
Interest cost on projected benefit obligations	169	197		339	394
Amortization of prior service Credit	(870)	(871)		(1,740)	(1,742)
Net periodic post-retirement credit	$ (400)	$ (350)		$ (800)	$ (700)