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) - 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)