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Postretirement Benefit Cost (Tables)
6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
The components of Net periodic benefit cost of the Company’s pension plan are as follows:
Three Months Ended
June 30,
Six Months Ended
June 30,
2019201820192018
Service cost$1,714 $2,001 $3,427 $4,003 
Interest cost521 469 1,042 938 
Expected return on plan assets(334)(287)(668)(575)
Net periodic benefit cost$1,901 $2,183 $3,801 $4,366