Stockholders' Investment

9 Months Ended

Sep. 30, 2015

Equity [Abstract]

Stockholders' investment

6. Stockholders’ Investment

Changes in stockholders’ investment for the three and nine months ended September 30, 2015 and 2014 consisted of the following (in thousands):

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2015			2014		2015			2014
Beginning balance	$	594,812		$	530,764	$	558,775		$	500,365
Net income	5,791			14,413		35,866			39,595
Share-based compensation	423			614		2,044			1,750
Issuance costs from secondary stock offering	(225		)	—		(225		)	—
Issuance of common stock from share-based compensation	(68		)	—		3,082			2,715
Excess tax benefit on share-based compensation	(16		)	76		1,175			1,442
Ending balance	$	600,717		$	545,867	$	600,717		$	545,867