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Note 11 - Business Segments and Significant Customers - Long-lived Assets by Geographic Area (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Long-lived assets $ 2,020,021 $ 2,032,685
UNITED STATES    
Long-lived assets 1,246,577 1,261,488
CANADA    
Long-lived assets 759,700 764,489
MEXICO    
Long-lived assets $ 13,744 $ 6,708