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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Preferred Stock
Common Stock
Class A Common Stock
Common Stock
Class B Common Stock
Additional Paid-in Capital
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2016 $ 980,239 $ 269,071 $ 537 $ 2 $ 614,226 $ 134,515 $ (29,070) $ (9,042)
Comprehensive income:                
Net income 46,407         46,407    
Other comprehensive income, net 16,850             16,850
Issuance of stock 0   5 2 (7)      
Exercise of stock options 1,963   3   1,676   284  
Share-based compensation expense 9,912       9,912      
Restricted stock surrendered due to employee tax liability (6,022)   (3)   (6,019)      
Shares purchased under the Dividend Reinvestment Plan (62)       61 (123)    
Stock appreciation right dividend equivalents (608)         (608)    
Dividends declared (19,433)         (19,433)    
Preferred stock dividends (15,338)         (15,338)    
Ending Balance at Sep. 30, 2017 1,013,908 269,071 542 4 619,849 145,420 (28,786) 7,808
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Reclassification of stranded tax effects to retained earnings 0         (496)   496
Adjusted Beginning Balance 1,012,308 269,071 517 5 621,435 144,343 (28,786) 5,723
Beginning Balance at Dec. 31, 2017 1,012,308 269,071 517 5 621,435 144,839 (28,786) 5,227
Comprehensive income:                
Net income 34,434         34,434    
Other comprehensive income, net (27,670)             (27,670)
Issuance of stock 0   2   (2)      
Redemption of preferred stock (40,250) (37,943)       (2,307)    
Share-based compensation expense 5,273       5,273      
Restricted stock surrendered due to employee tax liability (2,119)   (1)   (2,118)      
Shares purchased under the Dividend Reinvestment Plan (2)       201 (203)    
Stock appreciation right dividend equivalents (608)         (608)    
Dividends declared (19,492)         (19,492)    
Preferred stock dividends (15,196)         (15,196)    
Ending Balance at Sep. 30, 2018 $ 946,678 $ 231,128 $ 518 $ 5 $ 624,789 $ 140,971 $ (28,786) $ (21,947)