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Earnings Per Share (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) Vote $ / shares shares	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) Vote $ / shares shares	Jun. 30, 2017 USD ($) $ / shares shares
Earnings Per Share, by Common Class Method [Abstract]
Percentage of earnings or losses assumed in calculation	100.00%		100.00%
Preferential dividend rate of dividend paid on Class A Common Stock			105.00%
Common Stock [Member]
Earnings Per Share, by Common Class Method [Abstract]
Number of votes per share | Vote	1		1
Numerator [Abstract]
Distributed earnings	$ 3,494	$ 2,330	$ 6,984	$ 4,646
Undistributed earnings	2,226	3,355	4,547	6,536
Basic	5,720	5,685	11,531	11,182
Class A Common earnings	494	500	996	989
Diluted	$ 6,214	$ 6,185	$ 12,527	$ 12,171
Denominator [Abstract]
Weighted average shares outstanding - basic (in shares) | shares	19,312	19,377	19,364	19,337
Assumed conversion of Class A Common Stock (in shares) | shares	1,766	1,801	1,767	1,807
Dilutive options, awards and common stock equivalents (in shares) | shares	313	418	367	424
Total weighted-average diluted Common Stock (in shares) | shares	21,391	21,596	21,498	21,568
Basic earnings per share [Abstract]
Common Stock (in dollars per share) | $ / shares	$ 0.30	$ 0.29	$ 0.60	$ 0.58
Diluted earnings per share [Abstract]
Common Stock (in dollars per share) | $ / shares	$ 0.29	$ 0.29	$ 0.58	$ 0.56
Class A Common [Member]
Earnings Per Share, by Common Class Method [Abstract]
Number of votes per share | Vote	10		10
Numerator [Abstract]
Distributed earnings	$ 300	$ 203	$ 601	$ 407
Undistributed earnings	194	297	395	582
Class A Common earnings	$ 494	$ 500	$ 996	$ 989
Denominator [Abstract]
Weighted average shares outstanding (in shares) | shares	1,766	1,801	1,767	1,807
Basic earnings per share [Abstract]
Common Stock (in dollars per share) | $ / shares	$ 0.28	$ 0.28	$ 0.56	$ 0.55
Diluted earnings per share [Abstract]
Common Stock (in dollars per share) | $ / shares	$ 0.28	$ 0.27	$ 0.56	$ 0.54

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