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Stock Option and Equity Incentive Plans (Details 3) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Incentive Plan
Dec. 31, 2013
Options
Dec. 31, 2012
Options
Dec. 31, 2011
Options
Dec. 31, 2013
Restricted Stock Units
Dec. 31, 2012
Restricted Stock Units
Dec. 31, 2011
Restricted Stock Units
Jun. 12, 2013
Common stock
Non-employee members of Board of Directors
Dec. 31, 2013
Common stock
Non-employee members of Board of Directors
Dec. 31, 2012
Common stock
Non-employee members of Board of Directors
Dec. 31, 2011
Common stock
Executive officers
Feb. 18, 2013
Common stock
Incentive Plan
Chairman, Chief Executive Officer and President
Dec. 31, 2013
Common stock
Incentive Plan
Chairman, Chief Executive Officer and President
Dec. 31, 2012
Common stock
Incentive Plan
Chairman, Chief Executive Officer and President
Dec. 31, 2011
Common stock
Incentive Plan
Chairman, Chief Executive Officer and President
Stock Option and Equity Incentive Plans                                    
The total intrinsic value of all options exercised         $ 2,100,000 $ 2,000,000 $ 2,200,000                      
Total amount of consideration received from exercise of options         416,000 506,000 344,000                      
Shares surrendered in lieu of payment of exercise price and withholding taxes         26,662 22,161 20,492                      
Shares surrendered in lieu of payment of exercise price of awards         10,955                          
Net-share settlement (in shares)         15,707     22,089 25,684 30,920                
Average market price of shares surrendered in lieu of payment of withholding taxes (in dollars per share)         $ 20.54 $ 18.01 $ 17.64                      
Compensation expense         214,000 133,000 141,000 250,000 368,000 464,000   60,000 60,000     400,000 300,000 423,000
Shares approved for issuance       50,900                     400,000      
Shares of common stock issued                     1,227              
Closing price (in dollars per share)                     $ 19.08              
Grant date fair value of stock measured at closing price (in dollars)                           55,000        
Restricted Stock Units                                    
Outstanding at the beginning of the period (in shares)               108,866                    
Awarded (in shares)               10,600                    
Shares distributed (in shares)               (61,635)                    
Forfeited / cancelled (in shares)               (6,931)                    
Outstanding at the end of the period (in shares)               50,900 108,866                  
Weighted Average Award Date Fair Value                                    
Outstanding at the beginning of the period (in dollars per share)               $ 8.77                    
Awarded (in dollars per share)               $ 19.97                    
Shares distributed (in dollars per share)               $ 6.67                    
Forfeited / cancelled (in dollars per share)               $ 13.23                    
Outstanding at the end of the period (in dollars per share)               $ 11.94 $ 8.77                  
Net-share settlement, market price per share               $ 19.29 $ 16.10 $ 18.19                
Future share-based compensation expense                                    
2014 330,000       171,000     159,000                    
2015 242,000       140,000     102,000                    
2016 180,000       127,000     53,000                    
2017 51,000       43,000     8,000                    
Total 803,000       481,000     322,000                    
Tax benefits recognized as additional paid-in capital $ 818,000 $ 831,000 $ 700,000