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Income Per Common Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Numerator:      
Net income $ 83,842 $ 29,574 $ 21,584
Total dividends on preferred stocks 305 305 306
Numerator for basic net income per common share - net income applicable to common stock 83,537 29,269 21,278
Dividends on preferred stocks assumed to be converted, if dilutive 305 305 306
Interest expense including amortization of debt issuance costs, net of income taxes, on convertible debt assumed to be converted, if dilutive 299 1,061  
Numerator for diluted net income per common share 84,141 30,635 21,584
Denominator:      
Denominator for basic net income per common share - weighted-average shares 21,962,294 21,168,184 21,294,780
Effect of dilutive securities:      
Convertible preferred stocks 935,432 936,292 938,006
Stock options 325,752 186,258 255,660
Convertible notes payable 275,764 983,160 4,000
Dilutive potential common shares 1,536,948 2,105,710 1,197,666
Denominator for dilutive net income per common share-adjusted weighted-average shares and assumed conversions 23,499,242 23,273,894 22,492,446
Basic net income per common share $ 3.80 $ 1.38 $ 1.00
Diluted net income per common share $ 3.58 $ 1.32 $ 0.96
Series B Preferred stock [Member]
      
Numerator:      
Total dividends on preferred stocks (240) (240) (240)
Series D Preferred stock
      
Numerator:      
Total dividends on preferred stocks (60) (60) (60)
Noncumulative Preferred Stock [Member]
      
Numerator:      
Total dividends on preferred stocks $ (5) $ (5) $ (6)