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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Summary of employee benefits charged to operating expenses
    Three Months Ended June 30,     Six Months Ended June 30,  
(in thousands)   2015     2014     2015     2014  
Payroll taxes   $ 270     $ 275     $ 599     $ 568  
Medical plans     463       484       971       1,002  
401k match and profit sharing     223       176       495       329  
Pension plan     348       236       696       472  
Other     24       28       43       39  
Total employee benefits   $ 1,328     $ 1,199     $ 2,804     $ 2,410  
Schedule of components of net pension cost
    Estimated     Actual  
(in thousands)   2015     2014  
Service cost - benefits earned during the year   $ 1,325     $ 981  
Interest costs on projected benefit obligations     838       732  
Expected return on plan assets     (957 )     (872 )
Expected administrative expenses     40       40  
Amortization of prior service cost     79       79  
Amortization of unrecognized net loss     66       0  
Net periodic pension expense   $ 1,391     $ 960  
                 
Pension expense - three months ended June 30, (actual)   $ 348     $ 236  
Pension expense - six months ended June 30, (actual)   $ 696     $ 472