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Earnings per Share Earnings per Share (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2021 and 2020:
Three months ended
September 30,		Nine months ended
September 30,
2021202020212020
Weighted average common shares—basic42,889,922 43,457,704 43,061,707 43,707,331 
Dilutive effect of restricted stock units204,177 — 267,675 — 
Dilutive effect of stock options— — 16,395 — 
Weighted average common shares—diluted43,094,099 43,457,704 43,345,777 43,707,331