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Note 8 - Goodwill and Intangible Assets - Summary of Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Finite-lived intangible assets, gross $ 531,504 $ 500,289
Finite-lived intangible assets, accumulated amortization (404,653) (371,700)
Finite-lived intangible assets, net 126,851 128,589
Indefinite-lived tradenames, gross 128,321 128,321
Total intangible assets, gross 659,825 628,610
Total intangible assets, net $ 255,172 256,910
Trade Names [Member]    
Finite-lived intangible assets, useful life (Year) 8 years  
Finite-lived intangible assets, gross $ 50,742 43,252
Finite-lived intangible assets, accumulated amortization (20,189) (10,516)
Finite-lived intangible assets, net $ 30,553 32,736
Customer Lists [Member]    
Finite-lived intangible assets, useful life (Year) 9 years  
Finite-lived intangible assets, gross $ 333,935 314,600
Finite-lived intangible assets, accumulated amortization (288,623) (275,287)
Finite-lived intangible assets, net $ 45,312 39,313
Patents [Member]    
Finite-lived intangible assets, useful life (Year) 14 years  
Finite-lived intangible assets, gross $ 130,099 126,491
Finite-lived intangible assets, accumulated amortization (82,038) (72,719)
Finite-lived intangible assets, net $ 48,061 53,772
Unpatented Technology [Member]    
Finite-lived intangible assets, useful life (Year) 15 years  
Finite-lived intangible assets, gross $ 13,169 13,169
Finite-lived intangible assets, accumulated amortization (11,771) (11,628)
Finite-lived intangible assets, net $ 1,398 1,541
Computer Software, Intangible Asset [Member]    
Finite-lived intangible assets, useful life (Year)  
Finite-lived intangible assets, gross $ 1,046 1,046
Finite-lived intangible assets, accumulated amortization (1,046) (1,042)
Finite-lived intangible assets, net 4
Noncompete Agreements [Member]    
Finite-lived intangible assets, useful life (Year) 7 years  
Finite-lived intangible assets, gross $ 2,513 1,731
Finite-lived intangible assets, accumulated amortization (986) (508)
Finite-lived intangible assets, net $ 1,527 $ 1,223