Note 5 - Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2011

Schedule of Goodwill [Table Text Block]

	December 31,
	2010			2011
Balance at beginning of year	$	32,395		$	90,582
Goodwill acquired during the year		57,877			209,619
Adjustments to prior year acquisitions		(303	)		1,799
Effect of foreign currency translation		613			(1,740	)
Balance at end of year	$	90,582		$	300,260

Schedule of Finite-Lived Intangible Assets by Major Class [Table Text Block]

		December 31, 2010
	Estimated useful lives	Gross carrying amount		Accumulated amortization			Net carrying value
Amortizable intangible assets:
Customer relationships	40 to 42 months	$	70,163	$	(19,130	)	$	51,033
Tradenames	45 months		17,883		(4,606	)		13,277
Covenants not to compete	36 months		1,729		(841	)		888
Technology	24 to 40 months		3,427		(1,711	)		1,716
Totals		$	93,202	$	(26,288	)	$	66,914

		December 31, 2011
	Estimated useful lives	Gross carrying amount		Accumulated amortization			Net carrying value
Amortizable intangible assets:
Customer relationships	40 to 60 months	$	157,826	$	(50,438	)	$	107,388
Tradenames	45 to 84 months		48,046		(13,277	)		34,769
Covenants not to compete	36 months		2,784		(1,587	)		1,197
Technology	24 to 40 months		6,750		(3,936	)		2,814
Totals		$	215,406	$	(69,238	)	$	146,168

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

	Amount
Years ended December 31:
2012	$	49,008
2013		42,853
2014		26,943
2015		18,399
2016		6,092
Thereafter		2,873
Total	$	146,168