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Employee Retirement Plans (Contributions and Benefit Payments) (Details) - Pension Plans, Defined Benefit [Member]
3 Months Ended
Mar. 31, 2017
USD ($)
Non-qualified [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Benefit payments on non-qualified pension plans $ 300,000
Qualified [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Contributions on qualified pension plans $ 0