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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of employee benefits charged to operating expenses
  Three Months Ended June 30,  Six Months Ended June 30, 
(in thousands) 2017  2016  2017  2016 
Payroll taxes $288  $336  $644  $632 
Medical plans  468   487   894   999 
401k match and profit sharing  226   203   476   384 
Pension plan  351   306   703   613 
Other  9   46   25   62 
Total employee benefits $1,342  $1,378  $2,742  $2,690 
Schedule of components of net pension cost
  Estimated  Actual 
(in thousands) 2017  2016 
Service cost - benefits earned during the year $1,343  $1,179 
Interest costs on projected benefit obligations  1,008   956 
Expected return on plan assets  (1,123)  (1,057)
Expected administrative expenses  88   70 
Amortization of prior service cost  79   79 
Amortization of unrecognized net loss  11   0 
Net periodic pension expense $1,406  $1,227 
         
Pension expense - three months ended June 30, (actual) $351  $306 
Pension expense - six months ended June 30, (actual) $703  $613