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Acquisitions - Business Acquisition Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jul. 30, 2018
Business Acquisition [Line Items]        
Goodwill $ 283,708 $ 275,502 $ 274,082  
Sotera Health LLC's Nordion Medical Isotope Business        
Business Acquisition [Line Items]        
Accounts receivable – trade       $ 7,732
Contracts in progress       51
Inventories       2,113
Other current assets       97
Property, plant and equipment       12,948
Goodwill       62,495
Deferred Income Taxes       3,006
Intangible assets       139,257
Total assets acquired       227,699
Accounts payable       654
Accrued employee benefits       579
Accrued liabilities – other       1,665
Environmental liabilities       2,062
Pension liability       9,746
Total liabilities assumed       14,706
Net assets acquired       212,993
Amount of tax deductible goodwill       $ 53,693