Earnings Per Share - Schedule of Dilutive Effect of Stock Options RSUs and PSAs (Details) - shares shares in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Basic weighted-average shares outstanding	18,841	18,853	18,829	18,840	18,834	18,799	18,805	18,825	18,841	18,816	18,797
Effect of potential exercise of stock options, RSUs, and PSAs									294	408	538
Diluted weighted-average shares outstanding	19,143	19,086	19,020	19,197	19,234	19,169	19,133	19,263	19,135	19,224	19,335