Note 13 - Segment and Geographical Information (Details) - Reconciliation of Segment Profit to the Consolidated Statement of Comprehensive Loss - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Segment Profit to the Consolidated Statement of Comprehensive Loss [Abstract]
Segment Profit	[1]	$ 140,745	$ 132,140	$ 97,461
Depreciation and amortization		(55,691)	(60,280)	(62,748)
Share-based compensation expense		(22,289)	(20,024)	(17,157)
Acquisition-related transaction costs		(2,421)	(3,535)	(2,134)
Other expenses		388	(1,201)	(1,353)
Income from operations		$ 60,732	$ 47,100	$ 14,069

[1] For segment purposes, the Company defines "segment profit" as earnings before interest expenses, income taxes, depreciation and amortization, share-based compensation expenses, acquisition-related transaction costs and other expenses. A consolidated reconciliation from segment profit to income from operations is included below.