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Earnings per Share Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Weighted Average Number of Shares [Table Text Block] The following table summarizes the dilutive effect of RSUs and options to purchase common stock for the three and six months ended June 30, 2021 and 2020:
Three months ended
June 30,		Six months ended
June 30,
2021202020212020
Weighted average common shares—basic43,110,191 43,463,235 43,147,599 43,832,144 
Dilutive effect of restricted stock units198,165 — 299,425 — 
Dilutive effect of stock options— — 24,592 — 
Weighted average common shares—diluted43,308,356 43,463,235 43,471,616 43,832,144