Employee Benefit Plans - Textual (Details)	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	100.00%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	50.00%
Corporate Bonds And US Treasury Securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	50.00%
Long-term Investments
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	50.00%
Short-term Investments
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	50.00%