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Note 3 - Acquisitions - Preliminary Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Mar. 01, 2016
Dec. 31, 2015
Goodwill $ 721,523 $ 704,640   $ 669,719
Pramac [Member]        
Accounts receivable     $ 50,716  
Inventories     39,889  
Property and equipment     19,138  
Intangible assets     34,471  
Goodwill     46,775  
Other assets     7,698  
Total assets acquired     198,687  
Short-term borrowings     21,741  
Accounts payable     40,270  
Long-term debt and capital lease obligations (including current portion)     18,599  
Other liabilities     23,521  
Redeemable noncontrolling interest     34,253  
Noncontrolling interest     53  
Net assets acquired     $ 60,250