Stockholders' Equity and Earnings Per Share (Textual) (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) vote shares	Dec. 31, 2019 USD ($) shares	Nov. 06, 2019 USD ($)
Class of Stock [Line Items]
Aggregate purchase price | $	$ 1,002,000	$ 3,010,000
2019 Stock Repurchase Program
Class of Stock [Line Items]
Authorized amount available for repurchase | $			$ 25,000,000
Aggregate purchase price | $	$ 1,000,000.0	$ 3,000,000.0
Class A Common Stock
Class of Stock [Line Items]
Votes per share | vote	1
Common stock, shares authorized (in shares)	25,000,000
Treasury stock (in shares)	2,726,017	2,817,714
Class A Common Stock | 2019 Stock Repurchase Program
Class of Stock [Line Items]
Treasury stock, shares acquired (in shares)	32,286	28,094
Class A Common Stock | 2018 Stock Repurchase Program
Class of Stock [Line Items]
Treasury stock, shares acquired (in shares)		44,476
Class B Common Stock
Class of Stock [Line Items]
Votes per share | vote	10
Common stock, shares authorized (in shares)	6,756,176