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Employee Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock Options and Restricted Stock Units activity
The following table summarizes restricted stock units with only service conditions granted under our 2010 Equity Incentive Plan:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
 
(In thousands, except per share data)
Restricted stock units granted
120

 
94

 
183

 
195

Weighted-average grant-date fair value
$
71.20

 
$
35.60

 
$
67.17

 
$
31.23
Performance Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock Options and Restricted Stock Units activity
The following table summarizes the performance-based restricted stock units granted under our 2010 Equity Incentive Plan:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
 
(In thousands, except per share data)
Performance based restricted stock units granted (1)
168

 
329

 
612

 
616

Weighted-average grant-date fair value
$
71.47

 
$
36.35

 
$
49.04

 
$
36.01

(1
)
Performance awards granted also reflects the impact of any incremental shares awarded during the periods ended for performance periods completed. The grant date fair value for these awards are based on the grant price at the time of the initial award.