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Business segments (Long-lived Assets by Geographic Location) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets $ 1,085,476 $ 1,168,230 $ 1,318,943
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 809,545 869,388 932,173
Europe & Africa      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 184,768 202,852 313,589
Asia-Pacific      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 7,855 8,192 9,132
Middle East      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 3,175 3,189 3,192
Canada      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 79,403 83,688 59,207
Latin America      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets $ 730 $ 921 $ 1,650