NET INCOME PER COMMON SHARE (Tables)

12 Months Ended

Dec. 31, 2011

NET INCOME PER COMMON SHARE [Abstract]

Computation of basic and diluted net income per common share

The following table sets forth the computation of basic and diluted net income per common share for the periods indicated (in thousands, except per share data):

	Year Ended December 31,
	2011		2010		2009
Numerator:
Income from continuing operations	$	101,130	$	80,604	$	61,569
Income from discontinued operations	—		9,906		7,047
Net income	$	101,130	$	90,510	$	68,616
Denominator:
Denominator for basic calculation—weighted-average common shares	80,323		81,615		86,716
Weighted-average effect of dilutive securities	1,166		719		494
Denominator for diluted calculation	81,489		82,334		87,210
Net income per common share:
Basic income from continuing operations	$	1.26	$	0.99	$	0.71
Basic income from discontinued operations	—		0.12		0.08
Basic net income	$	1.26	$	1.11	$	0.79
Diluted income from continuing operations	$	1.24	$	0.98	$	0.71
Diluted income from discontinued operations	—		0.12		0.08
Diluted net income	$	1.24	$	1.10	$	0.79