CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 123,669	$ 59,595
OTHER COMPREHENSIVE INCOME:
Net reclassification adjustments for amounts recognized in net income as a component of net periodic benefit cost, net of income tax expense of $1,808 and $1,287, respectively	3,386	2,404
COMPREHENSIVE INCOME	$ 127,055	$ 61,999