CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 122,799	$ 123,669
OTHER COMPREHENSIVE INCOME:
Net reclassification adjustment for amounts recognized in net income as a component of net periodic benefit cost, net of income tax expense of $1,349 and $1,808, respectively	2,515	3,386
COMPREHENSIVE INCOME	$ 125,314	$ 127,055