XML 89 R65.htm IDEA: XBRL DOCUMENT v3.20.4
Employee Stock Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 24,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Additional Registered Shares   4,900,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 6,777,309 7,622,287  
Amortization of stock-based compensation $ 35,288 $ 41,070 $ 46,238
Tax benefits related to stock-based compensation awards $ 5,308 $ 7,308 $ 7,517