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Employee Benefit Plans - Target Asset Allocation of Plan Assets (Details) - Pension benefits
12 Months Ended
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]  
Neutral 100.00%
Equity Securities  
Defined Benefit Plan Disclosure [Line Items]  
Minimum 5.00%
Neutral 15.00%
Maximum 20.00%
Debt Securities  
Defined Benefit Plan Disclosure [Line Items]  
Minimum 80.00%
Neutral 85.00%
Maximum 95.00%