Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2014

Equity [Abstract]

Summary of Activities in Common Stock

The following table details activity in our common stock:

	Six months ended June 30,
	2014						2013
	Shares			Amount			Shares		Amount
Purchases of common stock		(294	)	$	(22,815	)		—	$	—
Stock option exercises		265			4,117			461		4,481
Employee stock plan purchases		26			2,014			35		1,634