Employee Retirement Benefits (Summary Of Components Of Net Periodic (Benefit) Cost) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Plan settlement costs				$ (1,222,276)
Austin Taylor Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost				50,000	$ 8,000
Interest cost			$ 26,000	122,000	143,000
Expected return on assets			(24,000)	(162,000)	(188,000)
Plan settlement costs	$ (43,000)	$ (1,222,000)	(43,000)	1,720,000
Amortization of prior service cost
Net periodic pension (benefit) cost			$ (41,000)	$ 1,730,000	$ (37,000)