Note 10 - Long-Term Debt Schedule of Long Term Debt (Details) - USD ($) $ in Thousands, shares in Millions		1 Months Ended	3 Months Ended		4 Months Ended	9 Months Ended
		Jun. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term debt			$ 1,230,246		$ 1,230,246	$ 1,230,246		$ 1,192,299
Loss on Repurchase of Debt Instrument			$ 11	$ 0		$ 91,887	$ 0
Senior Notes Due 2017
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			9.00%		9.00%	9.00%
Long-term debt			$ 191,752		$ 191,752	$ 191,752		190,245
Convertible Senior Notes Due 2017
Debt Instrument [Line Items]
Debt Issuance Cost	[1]		$ (408)		$ (408)	$ (408)		(3,974)
Debt Instrument, Interest Rate, Stated Percentage			3.00%		3.00%	3.00%
Long-term debt			$ 52,754		$ 52,754	$ 52,754		371,336
Long-term debt, Gross			60,899		60,899	60,899		450,000
Extinguishment of Debt, Amount		$ 389,100
Payments of Debt Extinguishment Costs		$ 126,800
Debt Conversion, Converted Instrument, Shares Issued		28.4
Loss on Repurchase of Debt Instrument		$ 91,900
Induced Conversion of Convertible Debt Expense		35,500
Losses on Extinguishment of Debt		52,300
Write off of Deferred Debt Issuance Cost		4,100
Convertible Debt, Termination of Capped Call Transaction, Total Consideration		$ 54,900
Convertible Debt, Termination of Capped Call Transaction, Number of Shares Received		2.3
Convertible Debt, Termination of Capped Call Transaction, Total Cash Received		$ 12,000
Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Debt Issuance Cost	[1]		$ (4,902)		$ (4,902)	$ (4,902)		(5,878)
Debt Instrument, Interest Rate, Stated Percentage			2.25%		2.25%	2.25%
Long-term debt			$ 346,443		$ 346,443	$ 346,443		336,133
Long-term debt, Gross			$ 399,992		$ 399,992	$ 399,992		400,000
Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			5.50%		5.50%	5.50%
Long-term debt			$ 295,472		$ 295,472	$ 295,472		294,585
Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			5.25%		5.25%	5.25%
Long-term debt			$ 343,825		$ 343,825	$ 343,825		0
Long-term debt, Gross		$ 350,000
Proceeds from Issuance of Long-term Debt					$ 343,500
Debt Instrument, Redemption Price, Percentage						100.00%
Debt Instrument, Basis Spread on Variable Rate		0.50%
Percent of Stock With Ordinary Voting Rights That Company Must Retain In Order To Make Any Capital Stock Transactions Under Debt Covenant Agreement			80.00%		80.00%	80.00%
Total Long Term Debt [Member]
Debt Instrument [Line Items]
Long-term debt			$ 1,230,246		$ 1,230,246	$ 1,230,246		1,192,299
New Accounting Pronouncement, Early Adoption, Effect [Member]
Debt Instrument [Line Items]
Debt Issuance Cost								(17,627)
New Accounting Pronouncement, Early Adoption, Effect [Member] | Senior Notes Due 2017
Debt Instrument [Line Items]
Debt Issuance Cost								(2,360)
New Accounting Pronouncement, Early Adoption, Effect [Member] | Convertible Senior Notes Due 2017
Debt Instrument [Line Items]
Debt Issuance Cost								(3,974)
New Accounting Pronouncement, Early Adoption, Effect [Member] | Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Debt Issuance Cost								(5,878)
New Accounting Pronouncement, Early Adoption, Effect [Member] | Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Debt Issuance Cost								(5,415)
New Accounting Pronouncement, Early Adoption, Effect [Member] | Total Long Term Debt [Member]
Debt Instrument [Line Items]
Debt Issuance Cost								(17,627)
Scenario, Previously Reported [Member] | Senior Notes Due 2017
Debt Instrument [Line Items]
Long-term debt								192,605
Scenario, Previously Reported [Member] | Convertible Senior Notes Due 2017
Debt Instrument [Line Items]
Long-term debt								375,310
Scenario, Previously Reported [Member] | Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Long-term debt								342,011
Scenario, Previously Reported [Member] | Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt								300,000
Scenario, Previously Reported [Member] | Total Long Term Debt [Member]
Debt Instrument [Line Items]
Long-term debt								$ 1,209,926

[1] Included within long-term debt and is being amortized over the life of the convertible notes.