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STOCK AWARD PLANS (Tables)
3 Months Ended
Mar. 31, 2018
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 March 31,
 
2018
 
2017
Stock options
$
5,002

 
$
3,002

Stock awards
12,212

 
8,410

Company expense on ESPP discount
920

 
906

Total stock-based compensation expense
$
18,134

 
$
12,318

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 March 31, 2018
Shares purchased
by employees
 
Aggregate cost
to employees
 
Expense recognized
by the company
65,416

 
$
5,211

 
$
920