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Defined Benefit Pension Plans (Tables)
 3 Months Ended
Mar. 31, 2020
Defined Benefit Plan [Abstract]  
Schedule of defined benefit plans disclosures
Net periodic cost related to all of the Company's defined benefit pension plans recognized in the Company's unaudited Condensed Consolidated Statements of Operations for the three months ended March 31, 2020 and 2019 included the following components:
 
Three Months Ended
(in thousands)
March 31,
2020
 
March 31,
2019
Service cost
$
320

 
$
316

Interest cost
4,141

 
5,584

Expected return on assets
(7,018
)
 
(7,471
)
Amortization of actuarial loss
2,620

 
2,722

Net periodic cost
$
63

 
$
1,151