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Share-Based Payments (Tables)
 6 Months Ended
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Option and Restricted Stock Unit Compensation Expense
Compensation expense, included within other selling and administrative expenses in the consolidated statements of operations, related to stock options and RSUs is as follows:
 
For the Three Months Ended
 
For the Six Months Ended
 
June 30,
2017
 
June 30,
2016
 
June 30,
2017
 
June 30,
2016
 
(In thousands)
Stock option compensation expense
$
2,743

 
$
1,919

 
$
5,816

 
$
4,298

RSU compensation expense
15,139

 
12,093

 
24,737

 
22,078

 
$
17,882

 
$
14,012

 
$
30,553

 
$
26,376