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Condensed Consolidated Statement of Shareholders' Equity - 9 months ended Sep. 30, 2016 - 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, 2015   2,000 24,649,044      
Stockholders' Equity, Beginning Balance at Dec. 31, 2015 $ 596,566 $ 48,163 $ 271 $ 241,239 $ 355,427 $ (48,534)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 36,047       36,047  
Dividends declared to preferred shareholders (3,656)       (3,656)  
Reversal of deferred tax asset related to stock options and executive deferred compensation distributions (1,030)     (1,030)    
Stock options exercised, shares     6,000      
Stock options exercised 73     (46)   119
Stock-based compensation expense 3,483     3,483    
Deferral of executive and director compensation 109     109    
Executive and director deferred compensation distributions shares     13,789      
Executive and director deferred compensation distributions 0     (274)   274
Shares Outstanding, Ending Balance at Sep. 30, 2016   2,000 24,668,833      
Stockholders' Equity, Ending Balance at Sep. 30, 2016 $ 631,592 $ 48,163 $ 271 $ 243,481 $ 387,818 $ (48,141)