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Summary Of Significant Accounting Policies Summary of Significant Accounting Policies (Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans Net Unamortized (Gain) Loss, Tax $ 2,505   $ 4,356
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax 9,424   8,090
Accumulated other comprehensive loss (9,424)   $ (8,090)
AOCI Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification of excess income tax benefits $ (1,742) $ 0