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Retirement Plans (Narrative) (Details)
3 Months Ended
Mar. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Contributed to pension plan $ 0
Estimated contribution in the current year $ 0
First 1% Of Contribution Saved [Member] | Other Post-Retirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Matching percentage 100.00%
Percentage of compensation saved 1.00%
Next 5% Of Contribution Saved [Member] | Other Post-Retirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Matching percentage 50.00%
Percentage of compensation saved 5.00%