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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

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Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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