Stockholders' Equity - Schedule of Capital Stock (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020 $ / shares shares	Sep. 30, 2019 $ / shares shares	Sep. 30, 2020 $ / shares shares	Sep. 30, 2019 $ / shares shares	Dec. 31, 2019 $ / shares shares
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000	5,000,000	5,000,000	5,000,000
Preferred stock, shares outstanding (in shares)	0	0	0	0	0
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Class A Common stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	70,000,000	70,000,000	70,000,000	70,000,000	70,000,000
Common stock, shares issued (in shares)	9,980,000	9,488,000	9,980,000	9,488,000	9,805,000
Treasury Stock (in shares)			365,000	365,000	365,000
Class A Common shares issued (in shares)	26,000	13,000	154,000	153,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Shares Outstanding Class B
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	30,000,000	30,000,000	30,000,000	30,000,000	30,000,000
Common stock, shares issued (in shares)	4,055,000	4,377,000	4,055,000	4,377,000	4,076,000
Class B Common converted to Class A Common (in shares)	8,000	6,000	21,000	44,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Common stock, convertible conversion ratio	1	1	1	1	1