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Earnings Per Share (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Vote
$ / shares
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
Vote
$ / shares
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Earnings Per Share, by Common Class Method [Abstract]        
Percentage of earnings or losses assumed in calculation 100.00%   100.00%  
Basic earnings per share [Abstract]        
Common Stock (in dollars per share) | $ / shares $ 0.30 $ 0.30 $ 0.48 $ 0.60
Diluted earnings per share [Abstract]        
Common Stock (in dollars per share) | $ / shares $ 0.29 $ 0.29 $ 0.47 $ 0.58
Common Stock [Member]        
Earnings Per Share, by Common Class Method [Abstract]        
Number of votes per share | Vote 1   1  
Numerator [Abstract]        
Distributed earnings $ 3,338 $ 3,494 $ 6,725 $ 6,984
Undistributed earnings 2,260 2,226 2,194 4,547
Basic 5,598 5,720 8,919 11,531
Class A Common earnings 448 494 749 996
Diluted $ 6,046 $ 6,214 $ 9,668 $ 12,527
Denominator [Abstract]        
Weighted average shares outstanding - basic (in shares) | shares 18,642 19,312 18,716 19,364
Assumed conversion of Class A Common Stock (in shares) | shares 1,621 1,766 1,689 1,767
Dilutive options, awards and common stock equivalents (in shares) | shares 279 313 318 367
Total weighted-average diluted Common Stock (in shares) | shares 20,542 21,391 20,723 21,498
Basic earnings per share [Abstract]        
Common Stock (in dollars per share) | $ / shares $ 0.30 $ 0.30 $ 0.48 $ 0.60
Diluted earnings per share [Abstract]        
Common Stock (in dollars per share) | $ / shares $ 0.29 $ 0.29 $ 0.47 $ 0.58
Class A Common [Member]        
Earnings Per Share, by Common Class Method [Abstract]        
Preferential dividend rate of dividend paid     105.00%  
Number of votes per share | Vote 10   10  
Numerator [Abstract]        
Distributed earnings $ 261 $ 300 $ 560 $ 601
Undistributed earnings 187 194 189 395
Class A Common earnings $ 448 $ 494 $ 749 $ 996
Denominator [Abstract]        
Weighted average shares outstanding (in shares) | shares 1,621 1,766 1,689 1,767
Basic earnings per share [Abstract]        
Common Stock (in dollars per share) | $ / shares $ 0.28 $ 0.28 $ 0.44 $ 0.56
Diluted earnings per share [Abstract]        
Common Stock (in dollars per share) | $ / shares $ 0.27 $ 0.28 $ 0.44 $ 0.56