Comprehensive Income

12 Months Ended

Dec. 31, 2011

Share Repurchase Program/Comprehensive Income [Abstract]

Comprehensive Income

(18) Comprehensive Income

Differences between net income and total comprehensive income resulted from net unrealized gains (losses) on the investment portfolio as follows:

	Years Ended December 31,
	2011		2010			2009
Net income	$	195,621	$	273,371		$	149,279
Other comprehensive income:
Unrealized gains on held-to-maturity investment portfolio at time of transfer to available-for-sale, net of tax		—		—			3,030
Unrealized gain (loss) on available-for-sale securities, net of tax		11,315		(727	)		2,346
Total change		11,315		(727	)		5,376
Comprehensive income	$	206,936	$	272,644		$	154,655

During the year ended December 31, 2009, the Company began reporting all of the debt securities in its investment portfolio as available-for-sale, other than certain auction rate securities that were subject to a forward contract and continued to be classified as trading securities until sold in 2010 (see Note 3). The change resulted in the reclassification of held-to-maturity securities and held-to-maturity investments on deposit as available-for-sale. The unrealized gains and losses, net of the related tax effects, were recorded to accumulated other comprehensive income.