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Employee Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of summary of employee benefits charged to operating expenses
(in thousands)
   
2016
   
2015
   
2014
 
Payroll taxes       $ 1,122         $ 1,102         $ 1,081    
Medical plans         1,881           1,928           1,974    
401(k) match         346           325           310    
Pension plan         1,227           1,391           960    
Profit-sharing         479           563           201    
Other         172           164           122    
Total employee benefits
      $ 5,227         $ 5,473         $ 4,648    
 
Schedule of obligations and funded status
(in thousands)
   
2016
   
2015
 
Change in projected benefit obligation:      
Balance, January 1       $ 20,601         $ 19,977    
Service cost         1,179           1,325    
Interest cost         956           838    
Actuarial (loss) gain         961           (1,084)    
Benefits paid         (464)           (455)    
Balance, December 31       $ 23,233         $ 20,601    
Change in plan assets:      
Fair value, January 1       $ 15,031         $ 14,933    
Actual return on plan assets         1,251           (75)    
Employer contribution         772           716    
Expenses paid         (88)           (88)    
Benefits paid         (464)           (455)    
Fair value, December 31       $ 16,502         $ 15,031    
Funded status at end of year
      $ (6,732)         $ (5,570)    
Accumulated benefit obligation
      $ 18,586         $ 16,550    
 
Schedule of components of net pension cost
(in thousands)
   
2016
   
2015
   
2014
 
Service cost - benefits earned during the year       $ 1,179         $ 1,325         $ 981    
Interest costs on projected benefit obligations         956           838           732    
Expected return on plan assets         (1,057)           (957)           (872)    
Expected administrative expenses         70           40           40    
Amortization of prior service cost         79           79           79    
Amortization of unrecognized net loss         0           66           0    
Net periodic pension expense
      $ 1,227         $ 1,391         $ 960    
 
Schedule of amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive income (loss), including amounts recognized in other comprehensive income
(in thousands)
   
2016
   
2015
Prior service costs       $ (285)         $ (364)
Net accumulated actuarial net loss         (2,723)           (1,937)
Accumulated other comprehensive loss         (3,008)           (2,301)
Net periodic benefit cost in excess of cumulative employer contributions         (3,724)           (3,269)
Net amount recognized at December 31, balance sheet
      $ (6,732)         $ (5,570)
Net gain (loss) arising during period       $ (786)           5
Prior service cost amortization         79           79
Amortization of net actuarial loss         0           65
Total recognized in other comprehensive income (loss)
      $ (707)         $ 149
Total recognized in net periodic pension cost and other comprehensive income
      $ 1,934         $ 1,242
 
Schedule of assumptions utilized to determine benefit obligations and to determine pension expense
     
2016
   
2015
   
2014
 
Determination of benefit obligation at year end:        
Discount rate
        4.40%           4.70%           4.25%    
Annual rate of compensation increase
        4.00%           3.78%           3.78%    
Determination of pension expense for year ended:        
Discount rate for the service cost
        4.70%           4.25%           5.00%    
Annual rate of compensation increase
        3.78%           3.78%           3.73%    
Expected long-term rate of return on plan assets
        7.00%           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, 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    
December 31, 2015          
Cash equivalents       $ 1,663         $ 1,663         $ 0         $ 0    
U.S gov’t agency obligations
        1,802           0           1,802           0    
Mutual funds
        11,566           11,566           0           0    
Total
      $ 15,031         $ 13,229         $ 1,802         $ 0    
 
Schedule of future benefit payments expected to be paid
Year
   
Pension 
benefits
 
(in thousands)    
2017       $ 630    
2018         677    
2019         802    
2020         873    
2021         1,036    
2022 to 2026         5,970