Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Narrative) (Details)

v3.20.4
Stock-Based Compensation (Narrative) (Details) - shares
12 Months Ended
May 01, 2019
Jun. 22, 2010
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum number of shares available for future issuance (in shares)     1,375,747    
U.S. federal corporate income tax rate     25.50% 25.20% 25.10%
Target Incentive Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
2010 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based awards, contractual term   10 years      
Shares authorized for issuance (in shares)     8,925,000    
PIEtech | Equity Plan | Restricted Stock Units and Performance Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized for issuance (in shares) 301,469        
Future grant date 60 days        
PIEtech | Equity Plan | Restricted Stock Units and Performance Stock Units | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
PIEtech | Equity Plan | Restricted Stock Units and Performance Stock Units | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     5 years