Pension, Savings, And Other Employee Benefits (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Estimated social security benefits age	65 years
Expected reduction to interest cost in 2016 [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ (5,800,000)
Non Qualified Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions to non-qualified plans		$ 4,900,000
Expected pension contribution		$ 5,200,000
Savings Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer investment in qualified defined contribution plan	100.00%
Maximum percent of employee pre-tax contributions that may be matched by the Company	6.00%