Earnings per Share Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2021

Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]

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:

	Year ended December 31,
	2021	2020	2019
Weighted average common shares—basic	43,006,922	43,581,232	45,303,659
Dilutive effect of restricted stock units	261,858	—	224,946
Dilutive effect of stock options	12,296	—	66,549
Weighted average common shares—diluted	43,281,076	43,581,232	45,595,154