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Share-based Compensation
6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based Compensation
Share-based Compensation

Share-based compensation expense was as follows:
 
For the three months ended June 30,
 
For the six months ended June 30,
 
2018
 
2017
 
2018
 
2017
Stock options, net of estimated forfeitures
$
2,074

 
$
9,550

 
$
(5,092
)
 
$
28,831

Restricted stock awards
5,613

 
3,399

 
9,023

 
6,506

Total
$
7,687

 
$
12,949

 
$
3,931

 
$
35,337



The negative stock options expense for the six months ended June 30, 2018 relates to the correction of an immaterial error recorded in the prior year.