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Accumulated Other Comprehensive Income (Loss) (Schedule of Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Abstract]      
Pension liability activity, actuarial gain (loss), before tax $ 545 $ (433) $ (190)
Pension liability activity, actuarial gain (loss), tax effect 119 (154) (67)
Pension liability activity, actuarial gain (loss), net of tax 426 (279) (123)
Pension liability activity, reclassfication adjustment for amortization of net loss, before tax 475 499 440
Pension liability activity, reclassification adjustment for amortization of net loss, tax effect 167 177 163
Pension liability activity, reclassification adjustment for amortization of net loss, net of tax 308 322 277
Postretirement liability activity, actuarial gain (loss), before tax 74 (1,586) 3,621
Postretirement liability activity, actuarial gain (loss), tax effect 17 (563) 1,273
Postretirement liability activity, actuarial gain (loss), net of tax 57 (1,023) 2,348
Postretirement liability activity, settlement gain, before tax   37,190  
Postretirement liability activity, settlement gain, tax effect   13,202  
Postretirement liability activity, settlement gain, net of tax   23,988  
Postretirement liability activity, reclassification adjustment for settlement income, before tax   (15,606)  
Postretirement liability activity, reclassification adjustment for settlement income, tax effect   (5,540)  
Postretirement liability activity, reclassification adjustment for settlement income, net of tax   (10,066)  
Postretirement liability activity, reclassification adjustment for prior service curtailment cost, before tax   38  
Postretirement liability activity, reclassification adjustment for prior service curtailment cost, tax effect   14  
Postretirement liability activity, reclassification adjustment for prior service curtailment cost, net of tax   24  
Postretirement liability activity, reclassification adjustment for amortization of net loss, before tax     647
Postretirement liability activity, reclassification adjustment for amortization of net loss, tax effect     237
Postretirement liability activity, reclassification adjustment for amortization of net loss, net of tax     410
Postretirement liability activity, reclassification adjustment for amortization of net gain, before tax (317) (97)  
Postretirement liability activity, reclassification adjustment for amortization of net gain, tax effect (112) (34)  
Postretirement liability activity, reclassification adjustment for amortization of net gain, net of tax (205) (63)  
Postretirement liability activity, reclassification adjustment for amortization of prior service cost, before tax 14 18 42
Postretirement liability activity, reclassfication adjustment for amortization of prior service cost, tax effect 4 6 15
Postretirement liability activity, reclassification adjustment for amortization of prior service cost, net of tax 10 12 27
Pre-tax 791 20,023 4,560
Tax 195 7,108 1,621
Other comprehensive income $ 596 $ 12,915 $ 2,939