STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE (Details 2) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Basic
Net income	$ 110,143	$ 94,097	$ 320,943	$ 292,872
Less: Earnings allocated to participating securities	0	0	0	3
Net income allocated to common stockholders	$ 110,143	$ 94,097	$ 320,943	$ 292,869
Basic weighted average shares outstanding (in shares)	144,122	143,861	144,061	143,788
Basic EPS (in dollars per share)	$ 0.76	$ 0.65	$ 2.23	$ 2.04
Diluted
Net income allocated to diluted common stockholders	$ 110,143	$ 94,097	$ 320,943	$ 292,869
Basic weighted average shares outstanding (in shares)	144,122	143,861	144,061	143,788
Diluted potential common shares (in shares)	1,116	729	1,025	680
Diluted weighted average shares outstanding (in shares)	145,238	144,590	145,086	144,468
Diluted EPS (in dollars per share)	$ 0.76	$ 0.65	$ 2.21	$ 2.03