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Earnings per Share Earnings per Share (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31, 2021 and 2020:
Three months ended
March 31,
20212020
Weighted average common shares—basic43,185,007 44,201,053 
Dilutive effect of restricted stock units400,685 217,074 
Dilutive effect of stock options49,184 52,345 
Weighted average common shares—diluted43,634,876 44,470,472