Employee Benefit Plans - Schedule of Assumptions Used (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure
Weighted average discount rate	4.20%	4.57%
Weighted average expected long-term rate of return on plan assets	8.94%	8.94%	8.94%
Assumed healthcare cost and trend rate	6.50%	7.00%	7.00%
Pension Benefits
Defined Benefit Plan Disclosure
Weighted average discount rate	4.57%	4.13%	4.99%
Other Postretirement and Postemployment Benefits
Defined Benefit Plan Disclosure
Weighted average discount rate	4.53%	4.13%	4.88%
Other Pension Plans, Postretirement or Supplemental Plans, Defined Benefit
Defined Benefit Plan Disclosure
Weighted average discount rate	4.50%	4.13%	5.00%