Summary of Significant Accounting Policies (Weighted-Average Number of Shares Used in Computing Earnings Per Share (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Weighted average basic shares outstanding (in shares)	12,061,419	12,225,481	12,255,490
Dilutive impact of employee stock awards (in shares)	0	153,608	253,023
Weighted average diluted shares outstanding (in shares)	12,061,419	12,379,089	12,508,513