Shareholders' Equity

12 Months Ended

Dec. 31, 2011

Shareholders' Equity [Abstract]

Shareholders' Equity

(9) SHAREHOLDERS' EQUITY

The following table details activity in our common stock:

	Years ended December 31,
	2011						2010						2009
	Shares			Amount			Shares			Amount			Shares			Amount
Purchases of common stock		(3,004	)	$	(71,802	)		(3,559	)	$	(65,793	)		(1,235	)	$	(17,000	)
Stock option exercises		582			3,553			615			3,181			425			2,295
Employee stock plan purchases		100			2,045			118			1,825			115			1,428

As of February 22, 2012 we had authorization from our board of directors to repurchase up to 1.7 million additional shares of our common stock.