Employee Benefit Plans, Weighted-Average Assumptions (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Minimum [Member]
Employee Benefit Plans (Textual)
Yield curve maturities	6 months
Maximum [Member]
Employee Benefit Plans (Textual)
Yield curve maturities	99 years
Pension Plans [Member]
Weighted Average Assumptions Used to Determine Benefit Obligation
Discount rate	4.08%	4.45%
Rate of compensation increase	3.81%	3.79%
Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost
Discount rate	4.45%	4.10%	4.92%
Expected long-term rate of return on plan assets	7.28%	7.29%	7.61%
Rate of compensation increase	3.79%	3.78%	3.81%
Other Postretirement Benefit Plans [Member]
Weighted Average Assumptions Used to Determine Benefit Obligation
Discount rate	4.26%	4.53%
Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost
Discount rate	4.53%	4.13%	4.88%