Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2016

Equity [Abstract]

Summary of Activities in Common Stock

The following table details activity in our common stock:

	Three months ended March 31,
	2016						2015
	Shares			Amount			Shares		Amount
Stock option exercises		79		$	1,781			180	$	3,425
Employee stock plan purchases		8			1,238			10		900
Purchase of common stock		(758	)		(94,497	)		—		—