Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION

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STOCK-BASED COMPENSATION
 6 Months Ended
Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
STOCK-BASED COMPENSATION
STOCK-BASED COMPENSATION
The following is a summary of stock-based compensation expense recorded by the Company during the respective periods:
  
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2014
 
2013
 
2014
 
2013
 
(in thousands)
Selling, general and administrative expenses
$
8,255

 
$
3,601

 
$
13,175

 
$
6,251

Corporate expenses
4,295

 
4,213

 
9,393

 
7,868

Total
$
12,550

 
$
7,814

 
$
22,568

 
$
14,119


The increase in stock-based compensation expense for the six months ended June 30, 2014 as compared to the same period of 2013 is due primarily to 2.2 million options and 0.7 million shares of restricted stock granted to management and directors during the first half of 2014, which will generally vest over one to four years. In addition, the Company granted other equity awards to employees during 2014, with the grant in the first quarter vesting over four years and the grant in the second quarter vesting at issuance. During the three and six months ended June 30, 2014, the Company recorded stock-based compensation expense for these other awards of $5.2 million and $5.5 million, respectively, as a component of selling, general and administrative expenses.
As of June 30, 2014, there was $60.1 million of total unrecognized compensation cost related to stock-based compensation arrangements for stock options, restricted stock awards and other equity awards. This cost is expected to be recognized over a weighted-average period of 2.7 years.