Note 13 - Segment and Geographical Information (Details) - Reconciliation of Segment Profit to the Consolidated Statement of Comprehensive Loss - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reconciliation of Segment Profit to the Consolidated Statement of Comprehensive Loss [Abstract]
Segment Profit	[1]	$ 36,357	$ 34,579	$ 68,309	$ 62,589
Depreciation and amortization	[1]	(13,729)	(14,858)	(28,577)	(29,200)
Share-based compensation expense		(6,565)	(4,627)	(12,701)	(9,980)
Acquisition related transaction costs		(134)	(762)	248	(1,954)
Other expenses		(66)	(186)	(276)	(186)
Income from operations		$ 15,863	$ 14,146	$ 27,003	$ 21,269

[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.