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Calculation of Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Calculation of Basic Earnings Per Share:          
Net Income $ 5,060 $ 3,520 $ 15,787 $ 17,267 $ 27,622
Weighted average shares outstanding 9,586,159 9,557,707 9,578,715 9,546,606  
Basic Earnings Per Share $ 0.53 $ 0.37 $ 1.65 $ 1.81  
Reconciliation of Numerator:          
Net Income 5,060 3,520 15,787 17,267 27,622
Effect of 8.25% Convertible debentures 13 15 27 31  
Adjusted Numerator-Diluted $ 5,073 $ 3,535 $ 15,814 $ 17,298  
Reconciliation of Denominator:          
Weighted average shares outstanding 9,586,159 9,557,707 9,578,715 9,546,606  
Effect of dilutive securities:          
Share-based Compensation 32,380 20,699 31,162 21,958  
8.25% Convertible debentures 63,058 72,481 64,363 73,810  
Adjusted denominator-Diluted 9,681,597 9,650,887 9,674,240 9,642,374  
Diluted Earnings Per Share $ 0.52 $ 0.37 $ 1.63 $ 1.79