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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of summary of employee benefits charged to operating expenses
    Three Months Ended September 30,     Nine Months Ended September 30,  
(in thousands)   2016     2015     2016     2015  
Payroll taxes   $ 251     $ 261     $ 883     $ 860  
Medical plans     415       491       1,414       1,462  
401k match and profit sharing     201       225       585       720  
Pension plan     307       348       920       1,044  
Other     56       56       118       99  
Total employee benefits   $ 1,230     $ 1,381     $ 3,920     $ 4,185  
Schedule of components of net pension cost
    Estimated     Actual  
(in thousands)   2016     2015  
Service cost - benefits earned during the year   $ 1,179     $ 1,325  
Interest costs on projected benefit obligations     956       838  
Expected return on plan assets     (1,057 )     (957 )
Expected administrative expenses     70       40  
Amortization of prior service cost     79       79  
Amortization of unrecognized net loss     0       66  
Net periodic pension expense   $ 1,227     $ 1,391  
                 
Pension expense - three months ended September 30, (actual)   $ 307     $ 348  
Pension expense - nine months ended September 30, (actual)   $ 920     $ 1,044