Note 13 - Segment and Geographical Information (Details) - Reconciliation of Segment Profit to the Consolidated Statement of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2015		Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014
Reconciliation of Segment Profit to the Consolidated Statement of Comprehensive Loss [Abstract]
Segment Profit	$ 37,076	[1]	$ 36,083	$ 105,384	[1]	$ 98,672
Depreciation and amortization	(12,997)	[1]	(15,705)	(41,574)	[1]	(44,905)
Share-based compensation expense	(5,393)		(4,680)	(18,094)		(14,660)
Acquisition related transaction costs	(634)		(871)	(1,327)		(2,825)
Other income (expenses)	84		(585)	749		(771)
Income from operations	$ 18,135		$ 14,242	$ 45,138		$ 35,511

[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.