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Business Segments (Long-lived Assets by Geographic Location) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets $ 1,063,635 $ 1,404,847 $ 1,085,476
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 868,295 1,087,381 809,545
Europe & Africa      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 100,451 213,008 184,768
Asia-Pacific      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 984 7,984 7,855
Middle East      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 6,049 7,362 3,175
Canada      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 87,221 88,280 79,403
Latin America      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets $ 635 $ 832 $ 730