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Calculation of Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Calculation of Basic Earnings Per Share:          
Net Income $ 4,356 $ 5,060 $ 19,225 $ 15,787 $ 28,863
Weighted shares outstanding - Basic (in shares) 9,621,580 9,586,159 9,611,610 9,578,715  
Basic Earnings Per Share (in usd per share) $ 0.45 $ 0.53 $ 2.00 $ 1.65  
Reconciliation of Numerator:          
Net Income 4,356 5,060 19,225 15,787 28,863
Effect of 8.25% Convertible debentures 11 13 22 27  
Adjusted numerator-Diluted $ 4,367 $ 5,073 $ 19,247 $ 15,814  
Reconciliation of Denominator:          
Weighted shares outstanding - Basic (in shares) 9,621,580 9,586,159 9,611,610 9,578,715  
Effect of dilutive securities:          
Share-based Compensation (in shares) 22,454 32,380 22,789 31,162  
8.25% Convertible debentures (in shares) 51,436 63,058 52,854 64,363  
Adjusted denominator-Diluted (in shares) 9,695,470 9,681,597 9,687,253 9,674,240  
Diluted Earnings Per Share (in usd per share) $ 0.45 $ 0.52 $ 1.99 $ 1.63