EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Numerator:
Net income	$ 56,453	$ 66,806
Denominator:
Basic weighted average shares outstanding (in shares)	80,648,000	82,719,000
Effect of dilutive securities - Stock options and awards (in shares)	968,000	1,067,000
Diluted weighted average shares outstanding (in shares)	81,616,000	83,786,000
Earnings (loss) per share
Basic earnings per share (in dollars per share)	$ 0.70	$ 0.81
Diluted earnings per share (in dollars per share)	$ 0.69	$ 0.80
Anti-dilutive shares excluded from the computation of diluted earnings per share	263,415	392,390