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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance $ 260,503 $ 274,629
Net income 1,819 3,621
Dividends declared (3,459) (3,386)
Acquisition of treasury stock (6,810)  
Restricted stock issuances (318) (533)
Amortization of restricted stock 972 1,061
Other comprehensive income 31 9
Cumulative effect adjustment   6,824
Ending balance 252,447 281,926
Class A Common Stock [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Dividends declared $ (291) $ (299)
Cash dividends, common stock (in dollars per share) $ 0.19 $ 0.17
Common Stock [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance $ 29,431 $ 29,079
Restricted stock issuances 27 34
Ending balance $ 29,458 $ 29,113
Cash dividends, common stock (in dollars per share) $ 0.20 $ 0.18
Common Stock [Member] | Class A Common Stock [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance $ 2,054 $ 2,280
Ending balance 2,054 2,280
Additional Paid-In Capital [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance 93,208 91,394
Restricted stock issuances (345) (567)
Amortization of restricted stock 972 1,061
Ending balance 93,835 91,888
Retained Earnings [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance 295,999 282,366
Net income 1,819 3,621
Dividends declared (3,459) (3,386)
Cumulative effect adjustment   6,824
Ending balance 294,068 289,126
Retained Earnings [Member] | Class A Common Stock [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Dividends declared (291) (299)
Accumulated Other Comprehensive Loss [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (2,087) (1,465)
Other comprehensive income 31 9
Ending balance (2,056) (1,456)
Treasury Stock [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (158,102) (129,025)
Acquisition of treasury stock (6,810)  
Ending balance $ (164,912) $ (129,025)