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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ 267,260 $ 291,778 $ 274,629 $ 294,142
Net income 6,097 8,352 15,765 20,879
Dividends declared (3,617) (3,452) (10,342) (10,436)
Acquisition of treasury stock (1,473) (5,175) (19,316) (14,456)
Restricted stock issuances   (71) (1,328) (1,233)
Class A conversion   0 0 0
Amortization of restricted stock 739 1,224 2,690 3,781
Director's compensation plan   42 627 439
Other comprehensive income 8 25 25 75
Cumulative effect adjustment 6,824 133 6,824 133
Ending balance $ 268,722 $ 292,423 $ 268,722 $ 292,423
Cash dividends, common stock (in dollars per share) $ 0.20 $ 0.18 $ 0.56 $ 0.54
Class A Common Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Dividends declared $ (292) $ (300) $ (852) $ (901)
Cash dividends, common stock (in dollars per share) $ 0.19 $ 0.17 $ 0.53 $ 0.51
Common Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ 29,418 $ 29,065 $ 29,079 $ 28,950
Restricted stock issuances   5 117 119
Class A conversion   5 222 6
Ending balance $ 29,418 $ 29,075 $ 29,418 $ 29,075
Cash dividends, common stock (in dollars per share) $ 0.20 $ 0.18 $ 0.56 $ 0.54
Common Stock [Member] | Class A Common Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ 2,058 $ 2,289 $ 2,280 $ 2,290
Class A conversion   (5) (222) (6)
Ending balance 2,058 2,284 2,058 2,284
Additional Paid-In Capital [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 91,847 89,650 91,394 88,978
Restricted stock issuances   (76) (1,445) (1,352)
Amortization of restricted stock 739 1,224 2,690 3,781
Director's compensation plan   19 (53) (590)
Ending balance 92,586 90,817 92,586 90,817
Retained Earnings [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 291,573 292,465 282,366 287,390
Net income 6,097 8,352 15,765 20,879
Dividends declared (3,617) (3,452) (10,342) (10,436)
Cumulative effect adjustment 6,824 133 6,824 133
Ending balance 293,761 297,065 293,761 297,065
Retained Earnings [Member] | Class A Common Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Dividends declared (292) (300) (852) (901)
Accumulated Other Comprehensive Income [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (1,448) (2,094) (1,465) (2,144)
Other comprehensive income 8 25 25 75
Ending balance (1,440) (2,069) (1,440) (2,069)
Treasury Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (146,188) (119,597) (129,025) (111,322)
Acquisition of treasury stock (1,473) (5,175) (19,316) (14,456)
Director's compensation plan   23 680 1,029
Ending balance $ (147,661) $ (124,749) $ (147,661) $ (124,749)