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Stock-based Compensation (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2019 (in thousands):
 
Stock Options
 
RSUs
 
PSOs
Equity awards outstanding, beginning of year
4,757

 
15

 
538
   Changes during the year:
 
 
 
 
 
   Granted
1,675

 
58

 
650

   Exercised
(1,140
)
 
(15
)
 
—

   Expired or forfeited
(949
)
 
—

 
(442
)
Equity awards outstanding, end of period
4,343

 
58

 
746
Schedule of RSU and PSU activity
The following table summarizes the activity for stock options, RSUs and PSOs for the six months ended June 30, 2019 (in thousands):
 
Stock Options
 
RSUs
 
PSOs
Equity awards outstanding, beginning of year
4,757

 
15

 
538
   Changes during the year:
 
 
 
 
 
   Granted
1,675

 
58

 
650

   Exercised
(1,140
)
 
(15
)
 
—

   Expired or forfeited
(949
)
 
—

 
(442
)
Equity awards outstanding, end of period
4,343

 
58

 
746
Schedule of compensation cost related to unvested awards
As of June 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
$
33,988

 
$
701

 
$
5,556

Expected weighted-average period in years of compensation cost to be recognized
3.1

 
0.9

 
1.3