Other Employee Benefits Long-Term Disability (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost	$ 45,463,000	$ (198,713,000)	$ 16,687,000
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	33,226,000	86,447,000	(94,989,000)
Long term disability [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost	$ 2,128	$ 2,619	$ 2,213
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.71%	3.18%	3.53%
Defined Benefit Plan, Benefit Obligation	$ 19,144,000	$ 19,789,000