Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Voting Common Stock [Member]
Common stock, par value (in USD per share)	$ 0.10	$ 0.10
Common stock, shares authorized (shares)	12,500,000	12,500,000
Common stock, shares issued (shares)	2,905,757	2,905,757
Common stock, shares outstanding (shares)	2,905,757	2,905,757
Non-Voting Common Stock [Member]
Common stock, par value (in USD per share)	$ 0.10	$ 0.10
Common stock, shares authorized (shares)	37,500,000	37,500,000
Common stock, shares issued (shares)	12,914,011	12,897,614
Common stock, shares outstanding (shares)	12,914,011	12,897,614
Senior Notes [Member]
Debt issuance costs	$ 571	$ 1,506
Note Payable, Related Party [Member]
Debt issuance costs	$ 874	$ 0