EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Numerator:
Net income	$ 77,332	$ 72,606	$ 133,785	$ 139,412
Denominator:
Basic weighted average shares outstanding (in shares)	79,873,000	82,419,000	80,260,000	82,569,000
Effect of dilutive securities - Stock options and awards (in shares)	900,000	992,000	934,000	1,037,000
Diluted weighted average shares outstanding (in shares)	80,773,000	83,411,000	81,194,000	83,606,000
Earnings (loss) per share
Basic earnings per share (in dollars per share)	$ 0.97	$ 0.88	$ 1.67	$ 1.69
Diluted earnings per share (in dollars per share)	$ 0.96	$ 0.87	$ 1.65	$ 1.67
Anti-dilutive shares excluded from the computation of diluted earnings per share	261,725	418,407	263,363	420,770