FEDERAL INCOME TAX (Income Tax) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current	$ 37,649	$ 15,649	$ 19,146
Deferred	(5,324)	1,677	6,616
Federal income tax expense	$ 32,325	$ 17,326	$ 25,762