Employment Benefit Plans Postretirement Health Care and Other Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Unfunded Accumulated Postretirement Benefit Obligations Determined By Company	$ 9,958
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation	187
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components	13
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation	260
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components	$ 19
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.00%	4.25%
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	$ 270
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	295
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	318
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	332
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	353
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	2,269
Defined Benefit Plan, Benefit Obligation	$ 3,837
Maximum [Member]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year	5.80%
Minimum [Member]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year	4.50%
Successor [Member]
Postemployment Benefits, Period Expense	$ 8,846	$ 2,570	$ 2,249