Quarterly Financial Data (unaudited)

12 Months Ended

Dec. 31, 2011

Quarterly Financial Data [Abstract]

Quarterly Financial Data (unaudited)

(17) Quarterly Financial Data (unaudited)

	Three Months Ended
2011	March 31		June 30		September 30		December 31
Premium revenues	$	1,535,795	$	1,523,433	$	1,600,502	$	1,641,695
Health benefits expenses		1,256,962		1,281,760		1,342,648		1,390,889
Selling, general and administrative expenses		116,459		122,289		130,785		145,271
Income before income taxes		112,777		69,444		76,514		51,111
Net income		70,477		44,294		48,074		32,776
Diluted net income per share		1.37		0.83		0.96		0.67
Weighted average number of common shares and dilutive potential common shares outstanding		51,534,794		53,541,368		50,253,757		49,179,891
	Three Months Ended
2010	March 31		June 30		September 30		December 31
Premium revenues	$	1,366,767	$	1,428,879	$	1,489,884	$	1,497,928
Health benefits expenses		1,141,572		1,176,445		1,199,706		1,204,383
Selling, general and administrative expenses		117,423		108,189		106,815		119,642
Income before income taxes		68,482		106,783		135,338		126,568
Net income		42,182		67,213		84,348		79,628
Diluted net income per share		0.82		1.31		1.68		1.59
Weighted average number of common shares and dilutive potential common shares outstanding		51,226,435		51,318,044		50,197,740		49,924,608