Stockholders' Investment

6 Months Ended

Jun. 30, 2014

Equity [Abstract]

Stockholders' investment

6. Stockholders’ Investment

Changes in stockholders’ investment for the three and six months ended June 30, 2014 and 2013 consisted of the following (in thousands):

	Three Months Ended June 30,					Six Months Ended June 30,
	2014		2013			2014		2013
Beginning balance	$	514,694	$	412,227		$	500,365	$	392,079
Net income	14,768		13,970			25,182		24,552
Share-based compensation	642		450			1,123		704
Issuance of common stock from share-based compensation	324		3,328			2,727		12,148
Excess tax benefit on share-based compensation	335		—			1,366		—
Other changes	1		(2		)	1		490
Ending balance	$	530,764	$	429,973		$	530,764	$	429,973