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CONSOLIDATED BALANCE SHEETS (Parenthetical) $ in Thousands	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares
Statement of Financial Position [Abstract]
Allowances for account receivable | $	$ 0	$ 1,523
Class A Common Stock
Common stock, par value (USD per share) | $ / shares	$ 1	$ 1
Common stock, shares outstanding (in shares) | shares	5,397,458	5,352,590
Class B Common Stock
Common stock, par value (USD per share) | $ / shares	$ 1	$ 1
Common stock, shares outstanding (in shares) | shares	1,568,670	1,568,810
Common stock, convertible conversion ratio	1	1

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