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Consolidated Statements of Shareholder's 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, 2014 $ 503,315 $ 79,877   $ 358 $ 6 $ 422,910 $ 29,589 $ (29,798) $ 373
Comprehensive income (loss):                  
Net income 62,072           62,072    
Other comprehensive income (loss), net (3,368)               (3,368)
Issuance of stock   110,873 $ 0 40 (5) (35)      
Exercise of stock options 501         (227)   728  
Stock-based compensation expense 9,328         9,328      
Restricted stock surrendered due to employee tax liability (2,254)     (3)   (2,251)      
Tax effect from stock compensation plan (137)         (137)      
Shares purchased under Dividend Reinvestment Plan (6)         202 (208)    
Stock appreciation right dividend equivalents (713)           (713)    
Dividends declared (17,383)           (17,383)    
Preferred stock dividends (9,823)           (9,823)    
Ending Balance at Dec. 31, 2015 652,405 190,750   395 1 429,790 63,534 (29,070) (2,995)
Comprehensive income (loss):                  
Net income 115,416           115,416    
Other comprehensive income (loss), net (6,047)               (6,047)
Issuance of stock   120,255 175,078 120 1 174,957      
Redemption or cancellation of stock (42,000) (41,934)         (66)    
Issuance of common stock to Stock Employee Compensation Trust 0     25   (25)   0  
Exercise of stock options (359)         (359)      
Stock-based compensation expense 11,947         11,947      
Restricted stock surrendered due to employee tax liability (4,436)     (3)   (4,433)      
Tax effect from stock compensation plan 2,116         2,116      
Shares purchased under Dividend Reinvestment Plan 58         233 (175)    
Stock appreciation right dividend equivalents (759)           (759)    
Dividends declared (23,521)           (23,521)    
Preferred stock dividends (19,914)           (19,914)    
Ending Balance at Dec. 31, 2016 980,239 269,071   537 2 614,226 134,515 (29,070) (9,042)
Comprehensive income (loss):                  
Net income 57,709           57,709    
Other comprehensive income (loss), net 14,269               14,269
Issuance of stock     0 4 3 (7)      
Redemption or cancellation of stock     $ 0 (25)   25      
Exercise of stock options 2,043     3   1,756   284  
Stock-based compensation expense 12,134         12,134      
Restricted stock surrendered due to employee tax liability (6,824)     (2)   (6,822)      
Shares purchased under Dividend Reinvestment Plan (58)         123 (181)    
Stock appreciation right dividend equivalents (811)           (811)    
Dividends declared (25,942)           (25,942)    
Preferred stock dividends (20,451)           (20,451)    
Ending Balance at Dec. 31, 2017 $ 1,012,308 $ 269,071   $ 517 $ 5 $ 621,435 $ 144,839 $ (28,786) $ 5,227