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Pension and Postretirement Plans (Tables)
 6 Months Ended
Jun. 30, 2020
Defined Benefit Pension Plan [Member]  
Schedule of Net Benefit Costs The total benefit arising from the Company’s defined benefit pension plans consists of the following components:
  Three Months Ended 
 June 30		Six Months Ended 
 June 30
(in thousands)2020201920202019
Service cost$5,804  $4,963  $11,587  $10,184  
Interest cost8,140  11,743  16,309  23,335  
Expected return on assets(28,290) (30,285) (56,734) (61,123) 
Amortization of prior service cost707  825  1,415  1,234  
Recognized actuarial gain—  37  —  —  
Net Periodic Benefit(13,639) (12,717) (27,423) (26,370) 
Special separation benefit expense
6,014  6,607  6,014  6,607  
Total Benefit$(7,625) $(6,110) $(21,409) $(19,763) 
Schedule of Allocation of Plan Assets The assets of the Company’s pension plan were allocated as follows:
  As of
  June 30,
2020		December 31,
2019
  
U.S. equities58 %62 %
Private investment fund16 %7 %
U.S. fixed income9 %10 %
U.S. stock index fund9 %14 %
International equities8 %7 %
  100 %100 %
Supplemental Executive Retirement Plan (SERP) [Member]  
Schedule of Net Benefit Costs
The total cost arising from the Company’s Supplemental Executive Retirement Plan (SERP) consists of the following components:
  Three Months Ended 
 June 30		Six Months Ended 
 June 30
(in thousands)2020201920202019
Service cost$239  $215  $477  $429  
Interest cost920  1,079  1,839  2,157  
Amortization of prior service cost82  84  165  169  
Recognized actuarial loss1,317  578  2,634  1,157  
Net Periodic Cost$2,558  $1,956  $5,115  $3,912  
Other Postretirement Benefit Plan, Defined Benefit [Member]  
Schedule of Net Benefit Costs
Other Postretirement Plans. The total cost arising from the Company’s other postretirement plans consists of the following components:
  Three Months Ended 
 June 30		Six Months Ended 
 June 30
(in thousands)2020201920202019
Interest cost$22  $72  $84  $144  
Amortization of prior service credit(121) (1,840) (241) (3,681) 
Recognized actuarial gain(927) (1,090) (2,024) (2,180) 
Net Periodic Benefit$(1,026) $(2,858) $(2,181) $(5,717)