Employee Retirement Benefits (Summary Of Components Of Net Periodic (Benefit) Cost) (Details) - Austin Taylor Pension Plan [Member] - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Service cost
Interest cost			26
Expected return on assets			(24)
Plan settement costs	$ (43)	$ (1,222)	(43)
Amortization of prior service cost
Net periodic pension (benefit) cost			$ (41)