Stockholders' Investment

3 Months Ended

Mar. 31, 2016

Equity [Abstract]

Stockholders' investment

6. Stockholders’ Investment

Changes in stockholders’ investment for the three months ended March 31, 2016 and 2015 consisted of the following (in thousands):

	Three Months Ended
	March 31,
	2016			2015
Beginning balance	$	556,439		$	524,287
Net income	900			9,820
Share-based compensation	549			796
Issuance of restricted stock units, net of taxes paid	(164		)	(839		)
Issuance of common stock from stock options	—			2,178
(Tax deficiency) excess tax benefit on share-based compensation	(253		)	811
Ending balance	$	557,471		$	537,053