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Business Segments (Long-lived Assets by Geographic Location) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 344,603 $ 399,735
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 298,171 332,554
Europe    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 25,956 42,424
Canada    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 14,977 17,796
Asia-Pacific    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 221 836
Middle East    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 4,412 4,877
Latin America    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 866 $ 1,248