Annual report pursuant to Section 13 and 15(d)

Share based compensation - Options Exercised (Details)

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Share based compensation - Options Exercised (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share based compensation      
Option Exercised (in shares) 5,723,646 11,401,390 3,549,298
Intrinsic value of stock options exercised $ 4,321,000 $ 8,195,000 $ 1,977,000
Proceeds from exercise of stock options 759,000 5,663,000 366,000
Tax benefit from stock option exercises $ 862,000 $ 1,265,000 $ 1,488,000