RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Components of Pension Cost for Defined Benefit Plans) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components of Pension Cost for Defined Benefit Plan
Service cost			$ 19,933	$ 19,062	$ 23,188
Interest cost			36,002	42,485	37,225
Expected return on plan assets			(54,638)	(67,953)	(61,244)
Amortization of prior service cost			(626)	(616)	(613)
Amortization of net loss			19,406	17,644	30,929
Settlement/curtailment loss	$ 6,407	$ 136,331	142,738	1,773	423
Pension cost for defined benefit plans			$ 162,815	$ 12,395	$ 29,908