Note 19 - Business Segments (Details) - Reconciling Information Between Reportable Segments and Consolidated Totals (USD $) In Thousands, unless otherwise specified	3 Months Ended						12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Revenues:
Revenues							$ 533,239	[1]	$ 501,773	[1]	$ 425,456	[1]
Operating income:
Operating income (loss)	21,615	29,797	37,862	12,065	24,383	25,742	96,958		(159,896)		61,555
Interest income	462	742	87	280	336	388	1,332		1,201		1,427
Interest expense, net	(21,950)	(18,459)	(17,504)	(15,400)	(14,263)	(14,878)	(73,776)		(64,069)		(69,459)
Foreign currency translation and transaction gains (losses)	1,241	1,258	904	615	(1,756)	14	5,085		242		(1,350)
Income attributable to sale of equity interest	5,603	5,027	5,783	2,311	2,589	2,517	19,945		10,127		11,474
Other non-operating income, net	9	137	29	215	286	(161)	1,592		590		671
Total consolidated income (loss) before income taxes and equity in income of investees	6,980	18,502	27,161	86	11,575	13,622	51,136		(211,805)		4,318
Total Segment Revenues [Member]
Revenues:
Revenues							533,239		501,773		425,456
Intersegment Revenues [Member]
Revenues:
Revenues							37,248		48,315		80,712
Intersegment Eliminations [Member]
Revenues:
Revenues							$ (37,248)		$ (48,315)		$ (80,712)

[1] Revenues as reported in the geographic area in which they originate.