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Stock-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of stock option activity
The following table summarizes the activity for stock options, RSUs and PSOs for the nine months ended September 30, 2019 (in thousands):
 
Stock Options
 
RSUs
 
PSOs
Equity awards outstanding, beginning of year
4,757

 
15

 
538
   Changes during the year:
 
 
 
 
 
   Granted
3,305

 
58

 
650

   Exercised
(1,164
)
 
(15
)
 
—

   Expired or forfeited
(1,168
)
 
—

 
(493
)
Equity awards outstanding, end of period
5,730

 
58

 
695
Schedule of RSU and PSU activity
The following table summarizes the activity for stock options, RSUs and PSOs for the nine months ended September 30, 2019 (in thousands):
 
Stock Options
 
RSUs
 
PSOs
Equity awards outstanding, beginning of year
4,757

 
15

 
538
   Changes during the year:
 
 
 
 
 
   Granted
3,305

 
58

 
650

   Exercised
(1,164
)
 
(15
)
 
—

   Expired or forfeited
(1,168
)
 
—

 
(493
)
Equity awards outstanding, end of period
5,730

 
58

 
695
Schedule of compensation cost related to unvested awards
As of September 30, 2019, total compensation cost related to unvested awards not yet recognized and the weighted-average periods over which the awards are expected to be recognized were as follows ($ in thousands):
 
Stock Options
 
RSUs
 
PSOs
Unrecognized compensation cost
$
41,872

 
$
512

 
$
4,791

Expected weighted-average period in years of compensation cost to be recognized
3.2

 
0.7

 
1.0