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Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Reclassification out of Accumulated Other Comprehensive Income [Line Items]    
INCOME BEFORE PROVISION FOR INCOME TAXES $ 9,323 $ 9,467
Provision for Income Taxes 2,692 2,918
Net Income (107) (99)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment    
Reclassification out of Accumulated Other Comprehensive Income [Line Items]    
Amortization of Defined Benefit Pension Items, Prior-Service Costs, Before Tax [1],[2] 3 3
Amortization of Net Retirement Plan Actuarial Loss, Before-Tax Amount [1],[2] (178) (166)
INCOME BEFORE PROVISION FOR INCOME TAXES (175) (163)
Provision for Income Taxes 68 64
Net Income $ (107) $ (99)
[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.