Note 4 - Earnings Per Common Share (Details) - Components Used in Computation of Basic and Diluted Earnings Per Common Share (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator:
Net income	$ 56,599	$ 58,935	$ 151,221	$ 123,895
Less: Net income allocated to preferred shareholder	(13,511)	(14,166)	(36,165)	(40,353)
Less: Net income allocated to unvested restricted stock	(77)	(90)	(211)	(169)
Net income available to common stockholders for basic earnings per common share	43,011	44,679	114,845	83,373
Effect of dilutive securities:
Net income allocated to preferred shareholder	13,511	14,166	36,165	40,353
Net income available to common and preferred stock for diluted earnings per share	56,563	58,886	151,500	124,216
Denominator:
Weighted average basic common shares outstanding (in Shares)	279,547,711	276,966,995	278,863,014	244,998,581
Weighted average additional common shares outstanding if preferred shares converted to common shares (if dilutive) (in Shares)	87,812,786	87,812,786	87,812,786	118,582,017
Total weighted average common shares outstanding if preferred shares converted to common shares (in Shares)	367,360,497	364,779,781	366,675,800	363,580,598
Effect of dilutive securities:
Stock options and stock appreciation rights (in Shares)	6,256,363	6,617,253	6,515,939	6,878,447
Weighted average diluted shares outstanding (in Shares)	404,929,710	402,709,884	404,504,589	401,771,895
Income per common share:
Basic (in Dollars per share)	$ 0.15	$ 0.16	$ 0.41	$ 0.34
Diluted (in Dollars per share)	$ 0.14	$ 0.15	$ 0.37	$ 0.31
1.25% Convertible Senior Notes Due August 2032 [Member]
Effect of dilutive securities:
Interest on 1¼% convertible senior notes due 2032, included in cost of sales	$ 41	$ 41	$ 490	$ 490
Effect of dilutive securities:
1¼% convertible senior notes due 2032 (in Shares)	31,312,850	31,312,850	31,312,850	31,312,850