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Equity (Tables)
12 Months Ended
Dec. 31, 2013
Equity [Abstract]  
Schedule of Nonvested Option Activity
    Number of Shares     Weighted Average Grant
Date Fair Value
 
Nonvested options - beginning of year     346,075     $ 5.02  
Nonvested options granted     136,350     $ 9.20  
Nonvested options vested or forfeited     (114,955 )   $ 4.67  
Nonvested options - end of year     367,470     $ 6.68  
Schedule of Stock Option Activity
    Year ended December 31,  
    2013     2012     2011  
    Options     Weighted
Average
Exercise
Price
    Options     Weighted
Average
Exercise
Price
    Options     Weighted
Average
Exercise
Price
 
Shares under option - beginning of year     716,235     $ 14.41       823,275     $ 13.20       807,620     $ 12.78  
Options granted     136,350       34.84       128,850       19.25       118,900       15.66  
Options exercised     (204,240 )     11.68       (226,160 )     12.72       (95,625 )     12.66  
Options cancelled     (4,750 )     17.47       (9,730 )     15.37       (7,620 )     14.37  
Shares under option - end of year     643,595       19.58       716,235       14.41       823,275       13.20  
Summary of Options Exercised
    Year Ended December 31,  
    2013     2012     2011  
Cash proceeds from stock options exercised   $ 1,668     $ 1,305     $ 1,210  
Tax benefits   $ 700     $ 100     $ -  
Intrinsic value of stock options exercised   $ 4,088     $ 1,359     $ 720  
Schedule of Assumptions Used to Estimate Fair Value of Stock Options
    Year Ended December 31,  
    2013     2012     2011  
Weighted-average expected stock-price volatility     37 %     38 %     40 %
Weighted-average expected option life     5.0 years       5.0 years       4.5 years  
Weighted-average risk-free interest rate     1.7 %     0.7 %     0.9 %
Weighted-average dividend yield     2.7 %     1.7 %     1.7 %
Schedule of Information about Options Outstanding and Exercisable by Exercise Price
          Options outstanding      
    Number     weighted average remaining   Options  
Exercise prices   outstanding     contractual life   exercisable  
 $6.15 - $6.93     47,930     0.99 years     47,930  
 $11.30 - $11.41     39,225     0.12 years     39,225  
$12.14     78,120     2.00 years     60,010  
$13.45     3,000     1.08 years     1,875  
 $15.59 - $15.62     113,010     3.90 years     44,550  
 $17.07 - $17.94     6,750     2.68 years     1,625  
 $19.03 - $19.33     219,210     4.11 years     80,910  
$21.76     5,000     4.09 years     -  
$22.20     4,000     5.09 years     -  
$35.75     127,350     6.00 years     -  
 Totals     643,595     3.69 Years     276,125