Note 17 - Net Income Per Share Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Income (Loss) from Continuing Operations Attributable to Parent		$ 45,193	$ 103,537	$ 136,920	$ 249,517
Income (Loss) From Continuing Operations, Diluted, Amount		48,900	109,040	144,300	260,475
Income from discontinued operations, net of tax		4,855	71,296	5,385	128,075
Net Income (Loss) Available to Common Stockholders, Basic		50,048	174,833	142,305	377,592
Net Income (Loss) Available to Common Stockholders, Diluted		$ 53,755	$ 180,336	$ 149,685	$ 388,550
Weighted-average number of common shares outstanding—basic		193,112	182,583	192,245	177,903
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	[1]	3,364	2,861	3,211	2,822
Weighted-average number of common and common equivalent shares outstanding—diluted		246,650	230,779	244,981	226,767
Net income from continuing operations		$ 0.23	$ 0.57	$ 0.71	$ 1.40
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share		0.03	0.39	0.03	0.72
Earnings Per Share, Basic		0.26	0.96	0.74	2.12
Income (Loss) from Continuing Operations, Per Diluted Share		0.20	0.47	0.59	1.15
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share		0.02	0.31	0.02	0.56
Earnings Per Share, Diluted		$ 0.22	$ 0.78	$ 0.61	$ 1.71
Convertible Debt [Member] | Convertible Senior Notes Due 2019
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Interest on Convertible Debt, Net of Tax	[2]	$ 3,707	$ 5,503	$ 7,380	$ 10,958
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities		37,736	37,736	37,736	37,736
Convertible Debt [Member] | Convertible Senior Notes Due 2017
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities		12,438	7,599	11,789	8,306
Stock Compensation Plan [Member]
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		264	1,484	530	1,484

[1] The following number of shares of our common stock equivalents issued under our stock-based compensation arrangements were not included in the calculation of net income per share because they were anti-dilutive: Three Months EndedJune 30, Six Months EndedJune 30,(in thousands)2015 2014 2015 2014Shares of common stock equivalents264 1,484 530 1,484

[2] As applicable, includes coupon interest, amortization of discount and fees, and other changes in income or loss that would result from the assumed conversion.