Note 2 - Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2014

Accounting Policies [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	2014
Volatility		49.01%	–	49.27%
Expected life (years)			6.00
Risk-free interest rate		1.81%	–	2.08%
Dividend yield			—
Fair value		$14.71	–	$17.26

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Number of options			Weighted average exercise price		Weighted average remaining contractual life (years)		Aggregate intrinsic value (in thousands)
Outstanding at December 31, 2013		7,334,745		$	12.33
Options granted		448,125			31.51
Options forfeited		(65,839	)		20.34
Options exercised		(973,146	)		14.58
Outstanding at March 31, 2014		6,743,885		$	13.13
Exercisable at March 31, 2014		4,992,036		$	11.20		6.7	$	118,849

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

	Number of awards			Weighted average grant date fair value
Non-vested awards at December 31, 2013		754,214		$	15.57
Awards granted		293,304			32.51
Awards vested		(139,659	)		14.12
Awards forfeited		(3,430	)		13.99
Non-vested awards at March 31, 2014		904,429		$	21.30

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Level 1		Level 2			Level 3			Total
As of December 31, 2013
Financial instruments:
Contingent consideration	$	—	$	—		$	(4,834	)	$	(4,834	)
Foreign currency derivative asset		—		61			—			61
Foreign currency derivative liability		—		(683	)		—			(683	)
As of March 31, 2014
Financial instruments:
Contingent consideration	$	—	$	—		$	(11,285	)	$	(11,285	)
Foreign currency derivative liability		—		(1,000	)		—			(1,000	)

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

	Foreign Currency Translation			Net investment hedge - foreign exchange contract			Net investment hedge - Australian denominated debt		Total
Balance at December 31, 2013	$	(6,625	)	$	483		$	205	$	(5,937	)
Change during 2014:
Before-tax amount		3,279			(3,734	)		—		(455	)
Tax (expense) benefit		(1,847	)		1,477			—		(370	)
Total activity in 2014		1,432			(2,257	)		—		(825	)
Balance at March 31, 2014	$	(5,193	)	$	(1,774	)	$	205	$	(6,762	)