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Pension and Other Retirement Plans - Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Compensation and Retirement Disclosure [Abstract]  
Defined Benefit Plan, Percent Increase on Service and Interest Cost Component 1.00%
Service cost and interest cost, 1% Increase $ 8
Service cost and interest cost, 1% Decrease (7)
Projected benefit obligation, 1% Increase 233
Projected benefit obligation, 1% Decrease $ (213)