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Note 5 - Revenues (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Revenue from Contract with Customer, Including Assessed Tax $ 265,761 $ 207,434  
Contract with Customer, Liability, Current 17,780   $ 15,008
Capitalized Contract Cost, Net, Current $ 2,800    
Capitalized Contract Cost, Amortization Period 1 year    
Selling, General and Administrative Expenses [Member]      
Capitalized Contract Cost, Amortization $ 800 700  
Other Noncurrent Liabilities [Member]      
Contract with Customer, Liability, Noncurrent 2,200   3,100
Other Noncurrent Assets [Member]      
Contract with Customer, Asset, Net, Noncurrent, Total 7,700   $ 7,500
Fees Imposed by Various Governmental Authorities Passed Through to Customer [Member]      
Revenue from Contract with Customer, Including Assessed Tax 4,100 3,500  
Cost of Goods and Services Sold, Total $ 4,100 $ 3,500