Annual report pursuant to Section 13 and 15(d)

Employee Retirement Benefits (Summary Of Components Of Net Periodic (Benefit) Cost) (Details)

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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)