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Employee Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of summary of employee benefits charged to operating expenses
(in thousands)
   
2017
   
2016
   
2015
 
Payroll taxes       $ 1,167         $ 1,122         $ 1,102    
Medical plans         2,026           1,881           1,928    
Pension plan         1,403           1,227           1,391    
401(k) match         365           346           325    
Profit-sharing         508           479           563    
Other         82           172           164    
Total employee benefits
      $ 5,551         $ 5,227         $ 5,473    
 
Schedule of obligations and funded status
(in thousands)
   
2017
   
2016
 
Change in projected benefit obligation:                          
Balance, January 1       $ 23,234         $ 20,602    
Service cost         1,343           1,179    
Interest cost         1,009           956    
Actuarial loss         2,843           961    
Benefits paid         (558)           (464)    
Balance, December 31       $ 27,871         $ 23,234    
Change in plan assets:                          
Fair value, January 1       $ 16,502         $ 15,031    
Actual return on plan assets         2,890           1,251    
Employer contribution         1,183           772    
Expenses paid         (93)           (88)    
Benefits paid         (558)           (464)    
Fair value, December 31       $ 19,924         $ 16,502    
Funded status at end of year
      $ (7,947)         $ (6,732)    
Accumulated benefit obligation
      $ 21,940         $ 18,586    
 
Schedule of components of net pension cost
(in thousands)
   
2017
   
2016
   
2015
 
Service cost - benefits earned during the year       $ 1,343         $ 1,179         $ 1,325    
Interest costs on projected benefit obligations         1,009           956           838    
Expected return on plan assets         (1,127)           (1,057)           (957)    
Expected administrative expenses         88           70           40    
Amortization of prior service cost         79           79           79    
Amortization of unrecognized net loss         11           0           66    
Net periodic pension expense
      $ 1,403         $ 1,227         $ 1,391    
 
Schedule of amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive loss, including amounts recognized in other comprehensive income
(in thousands)
   
2017
   
2016
 
Prior service costs       $ (207)         $ (285)    
Net accumulated actuarial net loss         (3,796)           (2,723)    
Accumulated other comprehensive loss         (4,003)           (3,008)    
Net periodic benefit cost in excess of cumulative employer contributions         (3,944)           (3,724)    
Net amount recognized at December 31, balance sheet
      $ (7,947)         $ (6,732)    
Net loss arising during period       $ (1,085)         $ (786)    
Prior service cost amortization         79           79    
Amortization of net actuarial loss         11           0    
Total recognized in other comprehensive loss
      $ (995)         $ (707)    
Total recognized in net periodic pension cost and other comprehensive income
      $ 2,398         $ 1,934    
 
Schedule of assumptions utilized to determine benefit obligations and to determine pension expense
     
2017
   
2016
   
2015
 
Determination of benefit obligation at year end:                                      
Discount rate
        3.75%           4.40%           4.70%    
Annual rate of compensation increase
        4.00%           4.00%           3.78%    
Determination of pension expense for year ended:                                      
Discount rate for the service cost
        4.40%           4.70%           4.25%    
Annual rate of compensation increase
        4.00%           3.78%           3.78%    
Expected long-term rate of return on plan assets
        6.75%           7.00%           7.00%    
Schedule of fair value of the Company's pension plan assets, by asset category
                 
Fair Value Measurements
 
(in thousands)
   
Fair Value
   
Quoted Prices 
in Active 
Markets for 
Identical 
Assets 
(Level 1)
   
Other 
Observable 
Inputs 
(Level 2)
   
Significant 
Unobservable 
Inputs 
(Level 3)
 
December 31, 2017                                                  
Cash equivalents       $ 1,307         $ 1,307         $ 0         $ 0    
U.S gov’t agency obligations
        1,781           0           1,781           0    
Mutual funds
        16,836           16,836           0           0    
Total
      $ 19,924         $ 18,143         $ 1,781         $ 0    
December 31, 2016                                                  
Cash equivalents       $ 1,362         $ 1,362         $ 0         $ 0    
U.S gov’t agency obligations
        2,376           0           2,376           0    
Mutual funds
        12,764           12,764           0           0    
Total
      $ 16,502         $ 14,126         $ 2,376         $ 0    
 
Schedule of future benefit payments expected to be paid
       
Year
   
Pension 
benefits
 
        (in thousands)              
        2018       $ 656    
        2019         677    
        2020         801    
        2021         872    
        2022         1,035    
        2023 to 2027         5,957