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Earnings Per Share (Details)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Vote
shares
Sep. 30, 2014
USD ($)
shares
Sep. 30, 2015
USD ($)
Vote
shares
Sep. 30, 2014
USD ($)
shares
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
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, Basic, by Common Class, Including Two Class Method [Line Items]        
Number of votes per share | Vote 1   1  
Numerator [Abstract]        
Distributed earnings $ 2,051 $ 22,181 $ 5,348 $ 25,434
Undistributed earnings 4,935 (15,057) 11,633 (8,330)
Basic 6,986 7,124 16,981 17,104
Class A Common earnings 669 700 1,626 1,677
Diluted $ 7,655 $ 7,824 $ 18,607 $ 18,781
Denominator [Abstract]        
Weighted average shares outstanding - basic (in shares) | shares 20,448 20,535 20,538 20,383
Assumed conversion of Class A Common Stock (in shares) | shares 2,061 2,151 2,074 2,223
Dilutive options, awards and common stock equivalents (in shares) | shares 282 253 295 330
Total weighted-average diluted Common Stock (in shares) | shares 22,791 22,939 22,907 22,936
Class A Common [Member]        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Number of votes per share | Vote 10   10  
Numerator [Abstract]        
Distributed earnings $ 195 $ 2,202 $ 507 $ 2,542
Undistributed earnings 474 (1,502) 1,119 (865)
Class A Common earnings $ 669 $ 700 $ 1,626 $ 1,677
Denominator [Abstract]        
Weighted average shares outstanding (in shares) | shares 2,061 2,151 2,074 2,223