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Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Reclassification out of Accumulated Other Comprehensive Income [Line Items]    
Amortization of Net Retirement Plan Actuarial Loss $ 46 $ 109
Income before provision for income taxes 10,589 9,323
Provision for Income Taxes 2,058 2,692
Net Income (45) (107)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment    
Reclassification out of Accumulated Other Comprehensive Income [Line Items]    
Amortization of Net Retirement Plan Actuarial Loss [1],[2] 1 3
Amortization of Net Retirement Plan Actuarial Loss, Before-Tax Amount [1],[2] (60) (178)
Income before provision for income taxes (59) (175)
Provision for Income Taxes 14 68
Net Income $ (45) $ (107)
[1] Amounts in parentheses indicate debits to profit/loss.
[2] These accumulated other comprehensive income components are included in the computation of net periodic pension cost.