Note 13 - Segment and Geographical Information (Details) - Segment Information - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
		Sep. 30, 2015		Sep. 30, 2014		Sep. 30, 2015		Sep. 30, 2014		Dec. 31, 2014
Note 13 - Segment and Geographical Information (Details) - Segment Information [Line Items]
Revenues		$ 206,033	[1]	$ 204,078		$ 611,087	[1]	$ 573,551
Segment profit		37,076	[1]	36,083		105,384	[1]	98,672
Depreciation and amortization expense		12,997	[1]	15,705		41,574	[1]	44,905
Capital expenditures		(2,495)	[1]	(2,582)		(7,337)	[1]	(6,192)
Nine months ended September 30, 2014
Total assets		1,068,421	[2]	940,017	[2]	1,068,421	[2]	940,017	[2]	$ 930,144
Long-lived assets	[2],[3]	632,790		686,702		632,790		686,702
UNITED STATES
Note 13 - Segment and Geographical Information (Details) - Segment Information [Line Items]
Revenues		128,768	[1]	123,112		382,611	[1]	346,504
Segment profit		22,242	[1]	21,187		64,516	[1]	57,770
Depreciation and amortization expense		8,519	[1]	9,148		27,001	[1]	25,037
Capital expenditures		(1,746)	[1]	(1,305)		(5,067)	[1]	(4,169)
Nine months ended September 30, 2014
Total assets	[2]	720,864		578,158		720,864		578,158
Long-lived assets	[2],[3]	464,505		482,513		464,505		482,513
CANADA
Note 13 - Segment and Geographical Information (Details) - Segment Information [Line Items]
Revenues		9,614	[1]	8,075		27,235	[1]	24,160
Segment profit		1,274	[1]	842		3,257	[1]	3,105
Depreciation and amortization expense		61	[1]	685		751	[1]	2,207
Capital expenditures		(39)	[1]	(3)		(208)	[1]	(12)
Nine months ended September 30, 2014
Total assets	[2]	24,223		27,195		24,223		27,195
Long-lived assets	[2],[3]	14,802		19,522		14,802		19,522
UNITED KINGDOM
Note 13 - Segment and Geographical Information (Details) - Segment Information [Line Items]
Revenues		46,915	[1]	48,865		140,371	[1]	139,583
Segment profit		8,839	[1]	8,154		24,020	[1]	23,613
Depreciation and amortization expense		2,128	[1]	2,962		6,608	[1]	9,230
Capital expenditures		(232)	[1]	(505)		(667)	[1]	(1,022)
Nine months ended September 30, 2014
Total assets	[2]	247,067		239,533		247,067		239,533
Long-lived assets	[2],[3]	93,854		103,945		93,854		103,945
AUSTRALIA
Note 13 - Segment and Geographical Information (Details) - Segment Information [Line Items]
Revenues		20,736	[1]	24,026		60,870	[1]	63,304
Segment profit		4,721	[1]	5,900		13,591	[1]	14,184
Depreciation and amortization expense		2,289	[1]	2,910		7,214	[1]	8,431
Capital expenditures		(478)	[1]	(769)		(1,395)	[1]	(989)
Nine months ended September 30, 2014
Total assets	[2]	76,267		95,131		76,267		95,131
Long-lived assets	[2],[3]	$ 59,629		$ 80,722		$ 59,629		$ 80,722

[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.

[2] Total assets and long-lived assets include goodwill. Goodwill recorded in connection with certain tax benefits to be realized in the Company's U.S. incometax returns has been reflected in the United States segment.

[3] Long-lived assets are noncurrent assets excluding deferred tax assets and deferred financing costs.