STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE (Details 2) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Basic
Net income	$ 103,284	$ 98,748	$ 210,800	$ 198,775
Less: Earnings allocated to participating securities	0	0	0	3
Net income allocated to common stockholders	$ 103,284	$ 98,748	$ 210,800	$ 198,772
Basic weighted average shares outstanding (in shares)	144,101	143,846	144,029	143,751
Basic EPS (in dollars per share)	$ 0.72	$ 0.69	$ 1.46	$ 1.38
Diluted
Net income allocated to diluted common stockholders	$ 103,284	$ 98,748	$ 210,800	$ 198,772
Basic weighted average shares outstanding (in shares)	144,101	143,846	144,029	143,751
Diluted potential common shares (in shares)	977	634	944	657
Diluted weighted average shares outstanding (in shares)	145,078	144,480	144,973	144,408
Diluted EPS (in dollars per share)	$ 0.71	$ 0.68	$ 1.45	$ 1.38