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Business segments (Long-lived Assets by Geographic Location) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets $ 1,359,401 $ 1,118,103 $ 988,729
United States [Member]
     
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 970,109 849,470 726,098
Europe & Africa [Member]
     
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 346,017 224,093 219,195
Canada [Member]
     
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 28,839 31,956 30,582
Asia-Pacific [Member]
     
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 9,465 7,512 7,495
Middle East [Member]
     
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 3,182 3,159 3,199
Latin America [Member]
     
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets $ 1,789 $ 1,913 $ 2,160