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Severance and Other Separation Costs (Tables)
 12 Months Ended
Dec. 31, 2020
Restructuring And Related Activities [Abstract]  
Schedule of Restructuring Program Activity

  The 2020 and 2018 Restructuring Program activity for the years ended December 31, 2020 and 2019 was as follows:

 

 

 

2020 Restructuring Program

 

 

2018 Restructuring Program

 

 

 

(In thousands)

 

Liability as of December 31, 2018

 

$

—

 

 

$

537

 

Costs incurred

 

 

—

 

 

 

—

 

Payments made

 

 

—

 

 

 

(537

)

Liability as of December 31, 2019

 

$

—

 

 

$

—

 

Costs incurred

 

 

2,658

 

 

 

—

 

Payments made

 

 

(2,513

)

 

 

—

 

Liability as of December 31, 2020

 

$

145

 

 

$

—