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STOCK AWARD PLANS (Tables)
6 Months Ended
Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
A summary of our total compensation expense recognized in our condensed consolidated statements of operations and comprehensive income for stock-based compensation is as follows (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Stock options
$
1,878

 
$
4,109

 
$
5,215

 
$
7,873

Stock awards
8,181

 
11,057

 
19,021

 
21,736

Company expense on ESPP discount
547

 
517

 
1,549

 
1,410

Total stock-based compensation expense
$
10,606

 
$
15,683

 
$
25,785

 
$
31,019

Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity
The following is a summary of the employee stock purchase plan activity (dollar amounts in thousands):
 
Three Months Ended June 30, 2016
Shares purchased
by employees
 
Aggregate cost
to employees
 
Expense recognized
by the company
48,943

 
$
3,094

 
$
547