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Employee Benefit Plans (Details 4)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Determination of benefit obligation at year end:      
Discount rate 3.75% 4.40% 4.70%
Annual rate of compensation increase 4.00% 4.00% 3.78%
Determination of pension expense for year ended:      
Discount rate for the service cost 4.40% 4.70% 4.25%
Annual rate of compensation increase 4.00% 3.78% 3.78%
Expected long-term rate of return on plan assets 6.75% 7.00% 7.00%