Retirement And Other Employee Benefits (Components Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 41,989	$ 36,609	$ 38,580
Interest cost	41,766	43,613	38,243
Expected return on plan assets	(53,868)	(49,552)	(44,222)
Amortization of prior service cost	787	836	856
Amortization of net loss (gain)	16,660	11,921	26,816
Curtailment/settlement charge	1,622	871	0
Net periodic benefit cost	48,956	44,298	60,273
Net gain (loss)	9,099	75,909	(108,387)
Amortization of prior service cost, and effects of curtailments/settlements	(933)	(847)	(856)
Amortization of net (loss) gain	(18,381)	(12,338)	(26,816)
Total recognized in accumulated other comprehensive income	(10,215)	62,724	(136,059)
Total recognized in net periodic benefit cost and other comprehensive income loss	38,741	107,022	(75,786)
Retirement Health Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	2,429	2,188	2,863
Interest cost	3,834	3,868	3,473
Expected return on plan assets	(3,267)	(3,081)	(2,998)
Amortization of prior service cost	(933)	(933)	(933)
Amortization of net loss (gain)	0	(516)	0
Curtailment/settlement charge	0	0	0
Net periodic benefit cost	2,063	1,526	2,405
Net gain (loss)	(2,382)	11,588	(11,449)
Amortization of prior service cost, and effects of curtailments/settlements	933	933	933
Amortization of net (loss) gain	0	516	0
Total recognized in accumulated other comprehensive income	(1,449)	13,037	(10,516)
Total recognized in net periodic benefit cost and other comprehensive income loss	$ 614	$ 14,563	$ (8,111)