Stockholders' Investment

6 Months Ended

Jun. 30, 2013

Equity [Abstract]

Stockholders' investment

6. Stockholders’ Investment

Changes in stockholders’ investment for the three and six months ended June 30, 2013 and 2012 consisted of the following (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Beginning balance	$	412,227	$	305,044	$	392,079	$	295,953
Net income	13,970		10,200		24,552		18,131
Other changes	3,776		280		13,342		1,440
Ending balance	$	429,973	$	315,524	$	429,973	$	315,524

In January 2013, the underwriters for the Company's public offering of common stock exercised in full their over-allotment option to purchase an additional 525,000 shares of common stock at a price of $17.25 per share to the public. The sale of the additional shares resulted in additional net proceeds to the Company of approximately $8.5 million after deducting the underwriting discount and estimated expenses.