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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Summary of employee benefits charged to operating expenses
    Three Months Ended March 31,  
(in thousands)   2015     2014  
Payroll taxes   $ 329     $ 293  
Medical plans     508       518  
401k match and profit sharing     272       153  
Pension plan     348       236  
Other     19       11  
                 
Total employee benefits   $ 1,476     $ 1,211  
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 March 31, (actual)   $ 348     $ 236