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Stock-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [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, 2020 (in thousands):
Stock OptionsRSUsPSOs
Equity awards outstanding, beginning of year5,901  58  837  
   Changes during the year:
   Granted1,963  226  —  
   Exercised(142) (58) (3) 
   Expired or forfeited(762) (100) (208) 
Equity awards outstanding, end of period6,960  126  626
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, 2020 (in thousands):
Stock OptionsRSUsPSOs
Equity awards outstanding, beginning of year5,901  58  837  
   Changes during the year:
   Granted1,963  226  —  
   Exercised(142) (58) (3) 
   Expired or forfeited(762) (100) (208) 
Equity awards outstanding, end of period6,960  126  626
Schedule of Compensation Cost Related to Unvested Awards
As of June 30, 2020, 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 OptionsRSUsPSOs
Unrecognized compensation cost$46,664  $1,818  $2,001  
Expected weighted-average period in years of compensation cost to be recognized2.92.40.6