Quarterly report pursuant to Section 13 or 15(d)

Employee Stock Plans (Details)

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Employee Stock Plans (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
A&R 2004 Plan
        
Stock-based compensation        
Number of shares of common stock reserved for issuance 37,240   37,240  
Expiration period     10 years  
Number of awards permitted to be issued (in shares)     0  
Stock options exercised (in shares) 0   0  
2010 Plan
        
Stock-based compensation        
Maximum number of shares of common stock that may be issued 2,130,000   2,130,000  
Restricted Stock Share Awards
        
Shares        
Unvested at the beginning of the period (in shares)   208,823 208,823  
Granted (in shares)     44,022  
Vested (in shares)     (82,942)  
Unvested at the end of the period (in shares) 169,903   169,903 208,823
Expected to vest in the future, at the end of the period (in shares) 163,786   163,786  
Weighted Average Grant Date Fair Value        
Unvested at the beginning of the period (in dollars per share)   $ 12.63 $ 12.63  
Granted (in dollars per share)     $ 14.78  
Vested (in dollars per share)     $ 12.97  
Unvested at the end of the period (in dollars per share) $ 13.03   $ 13.03 $ 12.63
Expected to vest in the future, at the end of the period (in dollars per share) $ 13.03   $ 13.03  
Weighted Average Remaining Contractual Term        
Unvested at the beginning of the period     1 year 10 months 2 days 1 year 11 months 8 days
Granted     2 years 6 months  
Unvested at the end of the period     1 year 10 months 2 days 1 year 11 months 8 days
Expected to vest in future, at the end of the period     1 year 10 months 2 days  
Recognized and unrecognized compensation expense with weighted average recognition period        
Compensation expenses recognized $ 281   $ 567  
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest 1,747   1,747  
Weighted average period over which unrecognized compensation expense is expected to be recognized     1 year 10 months 2 days  
Performance Share Unit Awards
        
Weighted Average Grant Date Fair Value        
Granted (in dollars per share)   $ 14.40    
Recognized and unrecognized compensation expense with weighted average recognition period        
Vesting period of awards     2 years  
Compensation expenses recognized 164   180  
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest 592   592  
Restricted Stock Unit Awards
        
Shares        
Unvested at the beginning of the period (in shares)   26,046 26,046  
Granted (in shares)     69,736  
Vested (in shares)     (53,022)  
Unvested at the end of the period (in shares) 42,760   42,760 26,046
Expected to vest in the future, at the end of the period (in shares) 41,721   41,721  
Weighted Average Grant Date Fair Value        
Unvested at the beginning of the period (in dollars per share)   $ 14.73 $ 14.73  
Granted (in dollars per share)     $ 14.52  
Vested (in dollars per share)     $ 14.68  
Unvested at the end of the period (in dollars per share) $ 14.46   $ 14.46 $ 14.73
Expected to vest in the future, at the end of the period (in dollars per share) $ 14.46   $ 14.46  
Weighted Average Remaining Contractual Term        
Unvested at the beginning of the period     2 years 29 days 8 months 19 days
Granted     1 year 1 month 10 days  
Unvested at the end of the period     2 years 29 days 8 months 19 days
Expected to vest in future, at the end of the period     2 years 29 days  
Recognized and unrecognized compensation expense with weighted average recognition period        
Compensation expenses recognized 72   712  
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest 477   477  
Accelerated stock based compensation expense   $ 261    
Maximum period following a termination of service in which the share-based award will be settled     2 months 15 days  
Restricted Stock Unit Awards | Non-employee director
        
Recognized and unrecognized compensation expense with weighted average recognition period        
Number of shares issued upon exercise of units other than options     1  
Restricted Stock Unit Awards | Management
        
Recognized and unrecognized compensation expense with weighted average recognition period        
Minimum age of employee, attaining which awards are continued to be vested upon retirement     65  
Minimum service period, upon serving which awards are continued to be vested upon retirement     10 years  
Minimum age of employee along with service period condition, attaining which awards are continued to be vested upon retirement     55  
Number of shares issued upon exercise of units other than options     1