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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Summary of Projected Benefit Obligation
(In thousands) 2015   2014
Projected benefit obligation:            
       Balance, January 1 $ 81,342     $ 63,439  
       Service cost   3,795       3,003  
       Interest cost   3,178       3,037  
       Actuarial (gain) loss     (8,358       13,349
       Benefits paid     (1,588 )     (1,486 )
Balance, December 31   $ 78,369     $ 81,342  
Plan assets:              
       Fair value, January 1   $ 72,972     $ 70,627  
       Actual return   (210 )     3,831  
       Employer contribution     —       —  
       Benefits paid     (1,588 )     (1,486 )
Fair value, December 31   $ 71,174     $ 72,972  
Funded status:              
Accrued pension liability   $ (7,195 )   $ (8,370 )
Schedule of Assumptions used to Determine Projected Benefit Obligation
2015   2014   2013
Weighted average discount rate 4.50 % 4.00 %   5.00 %
Rate of increase in compensation levels (a)   (a)
  3.75 %

 

(a)      
6.0% graded down to 3.25% over the first seven years of service
Schedule of Expected Pension Benefit Payments
Amount
2016 $ 2,064,000
2017   2,302,000
2018   2,630,000
2019   2,799,000
2020     3,023,000
2021-2025   20,160,000
Schedule of Plan's Pension Costs
For the Year Ended
December 31,
(In thousands) 2015 2014   2013
Service cost benefits earned during the year $ 3,796     $ 3,003     $ 3,452  
Interest cost on projected benefit obligations   3,178       3,037       2,819  
Expected return on plan assets     (4,864 )     (4,711 )     (4,469 )
Net amortization and deferral     1,542       244       1,729  
Net periodic pension cost   $ 3,652     $ 1,573     $ 3,531  
Schedule of Assumptions used to Determine Net Pension Cost
2015   2014   2015
Weighted average discount rate 4.00 %   5.00 %   4.25 %
Rate of increase in compensation levels (a)
  3.75 %   3.75 %
Expected long-term rate of return on assets 6.75 %   6.75 %   7.25 %

 

(a) 6.0% graded down to 3.25% over the first seven years of service
Schedule of Assumed Long-term Rate of Return on Assets
    One-Year Nominal   Annual Standard
Asset Class % of Total Portfolio   Return   Deviation
Core Fixed Income 50 %   4.84 %   4.64 %
Large Cap U.S. Equities 10 %   7.42 %   16.14 %
Large Cap U.S. Growth Equities   8.5 %   8.14 %   18.35 %
Large Cap U.S. Value Equities 8.5 %   7.29 %   16.27 %
Small Cap U.S. Equities   7 %   8.42 %   20.02 %
International (Developed) 15 %   8.80 %   19.35 %
International (Emerging)   1 %   10.49 %   27.66 %
Summary of the Fair Value Measurements by Type of Asset
  Fair Value Measurements as of December 31,
  2015   2014
    Quoted Prices       Quoted Prices
    in Active           in Active  
          Markets for   Significant       Markets for   Significant
          Identical   Observable       Identical   Observable
          Assets   Inputs       Assets   Inputs
(In thousands)     Total   (Level 1)   (Level 2)   Total   (Level 1)   (Level 2)
Cash     $ 283   $ 283   $ —   $ 268   $ 268   $ —
    Equity securities                          
    U.S. Large Cap Growth     6,507   —   6,507   7,165   —   7,165
    U.S. Large Cap Value     6,401   —   6,401   7,066   —   7,066
    U.S. Small/Mid Cap Growth     2,769   —   2,769   2,950   —   2,950
    U.S. Small/Mid Cap Value     2,649   —   2,649   2,721   —   2,721
    Non-U. S. Core     10,474   —   10,474   10,317   —   10,317
    U.S. Large Cap Passive     7,153   —   7,153   7,192   —   7,192
    Emerging Markets     599   —   599   703   —   703
Fixed Income                          
    U.S. Core     23,881   —   23,881   24,019   —   24,019
    U.S. Passive     9,328   —   9,328   9,275   —   9,275
    Opportunistic     1,130       1,130   1,296   —   1,296
                    Total     $ 71,174   $ 283   $ 70,891   $ 72,972   $ 268   $ 72,704
Supplemental Executive Retirement Plan [Member]  
Summary of Projected Benefit Obligation
December 31,
(In thousands) 2015 2014
Benefit obligation:
       Balance, January 1 $ 9,403     $ 8,048  
       Service cost   140       136  
       Interest cost   348       377  
       Benefits paid   (243 )     (236 )
       Actuarial (gain) loss     (900 )      1,078
Balance, December 31   $ 8,748     $ 9,403  
Schedule of Assumptions used to Determine Projected Benefit Obligation
2015   2014   2013
Weighted average discount rate 4.25 %  3.75 %   4.75 %
Rate of increase in compensation levels (a)   (a)
  3.75 %

 

(a)      
6.00% graded down to 3.25% over the first seven years of service.
Schedule of Expected Pension Benefit Payments
  Amount
2016   $ 247,000
2017   246,000
2018   311,000
2019   310,000
2020   308,000
2021-2025  
3,236,000
Schedule of Plan's Pension Costs
  For the Year Ended December 31,
(In thousands)   2015   2014   2013
Service cost – benefits earned during the year   $ 140   $ 136   $ 144
Interest cost on projected benefit obligations   348   377   335
Net amortization and deferral     654   431   551
Net periodic pension cost     $ 1,142   $ 944   $ 1,030
Schedule of Pretax Amounts in Accumulated Other Comprehensive Loss
  The Plan   SERP
(In thousands)   2015   2014   2015   2014
Prior service cost   $ —   $ —   $ —   $ —
Net actuarial loss   20,637   25,464   2,169   3,723
       Total     $ 20,637   $ 25,464   $ 2,169   $ 3,723