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Consolidated Statement of Shareholders' Equity - USD ($)
$ in Thousands
Total
Preferred Shares [Member]
Common Shares [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Shares [Member]
Shares Outstanding, Beginning Balance at Dec. 31, 2012   4,000 21,687,253      
Stockholders' Equity, Beginning Balance at Dec. 31, 2012 $ 335,428 $ 96,325 $ 246 $ 180,289 $ 117,048 $ (58,480)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 151,423       151,423  
Fair value over carrying value of preferred share redeemed   $ 2,190     (2,190)  
Dividends paid to preferred shareholders (3,656)       (3,656)  
Common share issuance - shares     2,461,000      
Net proceeds from issuance of common shares 54,617   $ 25 54,592    
Preferred shares redeemed - shares   (2,000)        
Preferred share redeemed - value (50,352) $ (50,352)        
Stock options exercised, shares     184,832      
Stock options exercised - value 2,640     (1,031)   3,671
Stock-based compensation expense 2,344     2,344    
Deferral of executive and director compensation 359     359    
Executive and director deferred compensation distributions shares     24,858      
Executive and director deferred compensation distributions 0     (493)   493
Shares Outstanding, Ending Balance at Dec. 31, 2013   2,000 24,357,943      
Stockholders' Equity, Ending Balance at Dec. 31, 2013 492,803 $ 48,163 $ 271 236,060 262,625 (54,316)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 50,789       50,789  
Dividends paid to preferred shareholders (4,875)       (4,875)  
Net proceeds from issuance of common shares 0          
Stock options exercised, shares     147,619      
Stock options exercised - value 1,944     (988)   2,932
Stock-based compensation expense 3,215     3,215    
Deferral of executive and director compensation 419     419    
Executive and director deferred compensation distributions shares     7,348      
Executive and director deferred compensation distributions 0     (146)   146
Shares Outstanding, Ending Balance at Dec. 31, 2014   2,000 24,512,910      
Stockholders' Equity, Ending Balance at Dec. 31, 2014 544,295 $ 48,163 $ 271 238,560 308,539 (51,238)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 51,763       51,763  
Dividends paid to preferred shareholders (4,875)       (4,875)  
Net proceeds from issuance of common shares $ 0          
Stock options exercised, shares (72,640)   72,640      
Stock options exercised - value $ 1,035     (408)   1,443
Stock-based compensation expense 3,942     3,942    
Deferral of executive and director compensation 406     406    
Executive and director deferred compensation distributions shares     63,494      
Executive and director deferred compensation distributions 0     (1,261)   1,261
Shares Outstanding, Ending Balance at Dec. 31, 2015   2,000 24,649,044      
Stockholders' Equity, Ending Balance at Dec. 31, 2015 $ 596,566 $ 48,163 $ 271 $ 241,239 $ 355,427 $ (48,534)