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Retirement Plans (Tables)
6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Components Of Net Periodic Pension Cost
The components of net periodic pension cost (income) of the UK Plan for the three and six months ended June 30, 2020 and 2019 were as follows (in thousands): 
 For the three months ended
June 30,
For the six months ended
June 30,
 2020201920202019
Interest cost$1,556  $2,004  $3,152  $4,043  
Expected return on plan assets(2,922) (3,064) (5,919) (6,180) 
Amortization of unrecognized loss581  590  1,176  1,190  
Net periodic pension cost (income)$(785) $(470) $(1,591) $(947)