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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Preferred Stock
Common 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 17,201           17,201    
Other comprehensive loss, net (660)               (660)
Issuance of stock     $ 0 1 1 (2)      
Share-based compensation expense 2,893         2,893      
Restricted stock surrendered due to employee tax liability (2,135)     (1)   (2,134)      
Stock appreciation right dividend equivalents (203)           (203)    
Dividends declared (6,474)           (6,474)    
Preferred stock dividends (5,113)           (5,113)    
Ending Balance at Mar. 31, 2017 985,748 269,071   537 3 614,983 139,926 (29,070) (9,702)
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 8,558           8,558    
Other comprehensive loss, net (17,265)               (17,265)
Share-based compensation expense 2,087         2,087      
Restricted stock surrendered due to employee tax liability (97)     0   (97)      
Shares purchased under the Dividend Reinvestment Plan (16)         58 (74)    
Stock appreciation right dividend equivalents (203)           (203)    
Dividends declared (6,503)           (6,503)    
Preferred stock dividends (5,113)           (5,113)    
Ending Balance at Mar. 31, 2018 $ 993,756 $ 269,071   $ 517 $ 5 $ 623,483 $ 141,008 $ (28,786) $ (11,542)