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Share-Based Payments (Tables)
 3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of 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
 
March 31,
2018
 
March 31,
2017
 
(In thousands)
Stock option compensation expense
$
2,684

 
$
3,073

RSU compensation expense
11,739

 
9,598

 
$
14,423

 
$
12,671