Note 9 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

	Three Months Ended March 31,
	2017		2016
Cost of services-compensation	$	2,040	$	1,931
Selling, general and administrative		3,346		2,309
Total	$	5,386	$	4,240

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

	Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Terms		Aggregate Intrinsic Value
Outstanding balance at December 31, 2016		5,191		$	17.35
Granted		-			-
Exercised		1			2.71
Forfeitures		(52	)		18.88
Expired		(16	)		24.87
Outstanding balance at March 31, 2017		5,124			17.32		4.76	$	20,130
Expected to vest at March 31, 2017		1,540			15.01		5.52		8,431
Exercisable at March 31, 2017		2,920		$	18.99		4.21	$	8,231

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

	Three Months Ended March 31,
	2017		2016
Expected dividend yield		―		―
Risk-free interest rate		―		1.20	%
Expected volatility		―		43.89	%
Expected life (years)		―		4.9

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

	Number of Units			Weighted Average Grant Date Fair Value per Unit
Outstanding balance at December 31, 2016		1,413		$	16.44
Granted		4			20.33
Vesting of restricted stock units, net of units withheld for taxes		(332	)		16.27
Units withheld for taxes		(140	)		16.27
Forfeitures		(28	)		17.99
Outstanding balance at March 31, 2017		917		$	16.51