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Pension Benefits - Actuarial Assumptions Pension Expense (Details) - Pension Plans, Defined Benefit [Member]
4 Months Ended 8 Months Ended 12 Months Ended
May 12, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]        
Discount Rate     4.10% 4.90%
Weighted-average Discount Rate     0.00% 0.00%
Interest Cost Discount Rate     0.00% 0.00%
Rate of Increase in Future Compensation Levels     3.31% 3.05%
Expected Long Term Rate of Return on Plan Assets     6.75% 7.00%
Post-Freeze [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Discount Rate   3.94%    
Weighted-average Discount Rate   4.22%    
Interest Cost Discount Rate   3.18%    
Rate of Increase in Future Compensation Levels   3.15%    
Expected Long Term Rate of Return on Plan Assets   6.25%    
Pre-Freeze [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Discount Rate 4.47%      
Weighted-average Discount Rate 4.78%      
Interest Cost Discount Rate 3.69%      
Rate of Increase in Future Compensation Levels 3.15%      
Expected Long Term Rate of Return on Plan Assets 6.25%