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Income Per Common Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Numerator:        
Net income $ 26,033 $ 28,645 $ 40,336 $ 49,548
Total dividends on preferred stocks      (300) (305)
Numerator for basic net income per common share - net income applicable to common stock 26,033 28,645 40,036 49,243
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   25   290
Numerator for diluted net income per common share 26,033 28,670 40,336 49,838
Denominator:        
Denominator for basic net income per common share - weighted-average shares 22,341 22,133 22,332 21,657
Effective of dilutive securities:        
Convertible preferred stocks 916,666 935,626 917,346 935,626
Stock options 251,838 362,634 266,776 359,158
Convertible notes payable   95,000   534,146
Dilutive potential common shares 1,168,504 1,393,260 1,184,122 1,828,930
Denominator for diluted net income per common share - adjusted weighted-average shares and assumed conversions 23,509 23,526 23,516 23,485
Basic net income per common share $ 1.17 $ 1.29 $ 1.79 $ 2.27
Diluted net income per common share $ 1.11 $ 1.22 $ 1.72 $ 2.12
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)