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Income Per Common Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Numerator:    
Net income $ 14,303 $ 20,903
Total dividends on preferred stocks (300) (305)
Numerator for basic net income per common share - net income applicable to common stock 14,003 20,598
Dividends on preferred stocks assumed to be converted, if dilutive 300 305
Interest expense including amortization of debt issuance costs, net of income taxes, on convertible debt assumed to be converted, if dilutive   265
Numerator for diluted net income per common share 14,303 21,168
Denominator:    
Denominator for basic net income per common share - weighted-average shares 22,324 21,180
Effect of dilutive securities:    
Convertible preferred stocks 918,026 935,626
Stock options 281,714 355,681
Convertible notes payable   973,292
Dilutive potential common shares 1,199,740 2,264,599
Denominator for diluted net income per common share - adjusted weighted-average shares and assumed conversions 23,524 23,444
Basic net income per common share $ 0.63 $ 0.97
Diluted net income per common share $ 0.61 $ 0.90
Series B preferred stock [Member]
    
Numerator:    
Total dividends on preferred stocks (240) (240)
Series D preferred stock [Member]
    
Numerator:    
Total dividends on preferred stocks (60) (60)
Noncumulative Preferred Stock [Member]
    
Numerator:    
Total dividends on preferred stocks   $ (5)