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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ 281,926 $ 294,522 $ 274,629 $ 294,142
Net income 6,046 6,214 9,668 12,527
Dividends declared (3,338) (3,493) (6,725) (6,984)
Acquisition of treasury stock (17,843) (5,757) (17,843) (9,281)
Restricted stock issuances (795) (816) (1,328) (1,162)
Class A conversion 0 0 0 0
Amortization of restricted stock 890 986 1,951 2,557
Director's compensation plan 627 397 627 397
Other comprehensive income 8 25 17 50
Cumulative effect adjustment 6,824 133 6,824 133
Ending balance $ 267,260 $ 291,778 $ 267,260 $ 291,778
Cash dividends, common stock (in dollars per share) $ 0.18 $ 0.18 $ 0.36 $ 0.36
Class A Common Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Dividends declared $ (261) $ (300) $ (560) $ (601)
Cash dividends, common stock (in dollars per share) $ 0.17 $ 0.17 $ 0.34 $ 0.34
Common Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ 29,113 $ 28,979 $ 29,079 $ 28,950
Restricted stock issuances 83 85 117 114
Class A conversion 222 1 222 1
Ending balance $ 29,418 $ 29,065 $ 29,418 $ 29,065
Cash dividends, common stock (in dollars per share) $ 0.18 $ 0.18 $ 0.36 $ 0.36
Common Stock [Member] | Class A Common Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance $ 2,280 $ 2,290 $ 2,280 $ 2,290
Class A conversion (222) (1) (222) (1)
Ending balance 2,058 2,289 2,058 2,289
Additional Paid-In Capital [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 91,888 90,174 91,394 88,978
Restricted stock issuances (878) (901) (1,445) (1,276)
Amortization of restricted stock 890 986 1,951 2,557
Director's compensation plan (53) (609) (53) (609)
Ending balance 91,847 89,650 91,847 89,650
Retained Earnings [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 289,126 290,044 282,366 287,390
Net income 6,046 6,214 9,668 12,527
Dividends declared (3,338) (3,493) (6,725) (6,984)
Cumulative effect adjustment 6,824 133 6,824 133
Ending balance 291,573 292,465 291,573 292,465
Retained Earnings [Member] | Class A Common Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Dividends declared (261) (300) (560) (601)
Accumulated Other Comprehensive Income [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (1,456) (2,119) (1,465) (2,144)
Other comprehensive income 8 25 17 50
Ending balance (1,448) (2,094) (1,448) (2,094)
Treasury Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (129,025) (114,846) (129,025) (111,322)
Acquisition of treasury stock (17,843) (5,757) (17,843) (9,281)
Director's compensation plan 680 1,006 680 1,006
Ending balance $ (146,188) $ (119,597) $ (146,188) $ (119,597)