Stock Repurchases (Tables)

6 Months Ended

Jun. 30, 2013

Equity [Abstract]

Information Regarding Shares of Common Stock Repurchased

The following table sets forth information regarding the shares of our common stock that we repurchased in the periods indicated:

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Number of shares		0		928,500		0		3,025,700
Total cost	$	0	$	61,261	$	0	$	207,918
Average cost per share	$	0	$	65.98	$	0	$	68.72