Note 11 - Long-Term Debt Schedule of Long Term Debt (Details)		1 Months Ended		2 Months Ended	7 Months Ended	8 Months Ended	10 Months Ended	12 Months Ended
		Jun. 30, 2015 USD ($) shares	May. 31, 2014 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2015 USD ($) basispoint $ / shares shares	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 USD ($) days d basispoint $ / shares shares	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Mar. 31, 2013 USD ($)	Nov. 30, 2010	Nov. 15, 2010 USD ($)	Jun. 01, 2005 USD ($)
Debt Instrument [Line Items]
Long-term debt (Note 11)					$ 1,219,454,000	$ 1,192,299,000		$ 1,219,454,000	$ 1,192,299,000
Repayments of Long-term Debt								$ 156,172,000	57,223,000	$ 79,372,000
Senior Notes Due 2015
Debt Instrument [Line Items]
Debt Instrument, Face Amount														$ 250,000,000
Gains (Losses) on Extinguishment of Debt									(2,800,000)
Repayments of Long-term Debt									57,200,000
Senior Notes Due 2017
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					9.00%			9.00%
Long-term debt (Note 11)					$ 192,261,000	190,245,000		$ 192,261,000	190,245,000
Convertible Senior Notes Due 2017
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					3.00%			3.00%
Long-term debt (Note 11)					$ 46,115,000	371,336,000		$ 46,115,000	371,336,000
Extinguishment of Debt, Amount		$ 389,100,000						389,100,000
Gains (Losses) on Extinguishment of Debt		(52,300,000)
Repayments of Convertible Debt		$ 126,800,000
Debt Conversion, Converted Instrument, Shares Issued | shares		28,400,000
Gain (Loss) on Repurchase of Debt Instrument		$ (91,900,000)						$ (91,900,000)
Induced Conversion of Convertible Debt Expense		35,500,000
Write off of Deferred Debt Issuance Cost		4,100,000
Convertible Debt, Termination of Capped Call Transaction, Total Consideration		$ 54,900,000
Convertible Debt, Termination of Capped Call Transaction, Number of Shares Received | shares		2,300,000
Convertible Debt, Termination of Capped Call Transaction, Total Cash Received					$ 13,200,000
Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					2.25%			2.25%
Long-term debt (Note 11)					$ 341,214,000	336,133,000		$ 341,214,000	336,133,000
Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			5.50%		5.50%			5.50%
Long-term debt (Note 11)					$ 295,751,000	294,585,000		$ 295,751,000	294,585,000
Debt Instrument, Face Amount			$ 300,000,000
Proceeds from Issuance of Long-term Debt						$ 293,800,000
Debt Instrument, Redemption Price, Percentage						100.00%
Number of Basis Points Added to Treasury Rate Used in Calculating Redemption Price of Debt | basispoint					50			50
Debt Instrument, Basis Spread on Variable Rate		0.50%
Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					5.25%			5.25%
Long-term debt (Note 11)					$ 344,113,000	$ 0		$ 344,113,000	0
Debt Instrument, Face Amount		$ 350,000,000
Proceeds from Issuance of Long-term Debt					343,300,000
Debt Instrument, Redemption Price, Percentage								100.00%
Debt Instrument, Basis Spread on Variable Rate			0.50%
Total Long Term Debt
Debt Instrument [Line Items]
Long-term debt (Note 11)					$ 1,219,454,000	1,192,299,000		$ 1,219,454,000	1,192,299,000
Senior Notes [Member]
Debt Instrument [Line Items]
Percent of Stock With Ordinary Voting Rights That the Company Must Retain In Order to Make Any Capital Stock Transactions Under Debt Covenant Agreement					80.00%			80.00%
Convertible Debt [Member] | Convertible Senior Notes Due 2017
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage												3.00%
Long-term debt (Note 11)					$ 46,115,000	371,336,000		$ 46,115,000	371,336,000
Unamortized Debt Issuance Expense	[1]				$ (314,000)	(3,974,000)		$ (314,000)	(3,974,000)
Debt Instrument, Face Amount													$ 450,000,000
Proceeds from Issuance of Long-term Debt				$ 391,300,000
Debt Instrument, Interest Rate, Effective Percentage												9.75%
Debt Instrument, Convertible, Conversion Ratio								85.5688
Debt Conversion, Converted Instrument, Amount								$ 1,000
Debt Instrument, Convertible, Conversion Price | $ / shares					$ 11.69			$ 11.69
Common Stock, Capital Shares Reserved for Future Issuance | shares					23,000,000			23,000,000
Maximum Stock Price Per Share Included In Capped Call Transaction | $ / shares					$ 14.11			$ 14.11
Cash Paid To Purchase Capped Call Transactions													$ 46,100,000
Convertible Debt [Member] | Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage											2.25%
Long-term debt (Note 11)					$ 341,214,000	336,133,000		$ 341,214,000	336,133,000
Unamortized Debt Issuance Expense	[1]				$ (4,465,000)	$ (5,878,000)		$ (4,465,000)	$ (5,878,000)
Debt Instrument, Face Amount											$ 400,000,000
Proceeds from Issuance of Long-term Debt							$ 389,800,000
Debt Instrument, Interest Rate, Effective Percentage											6.25%
Debt Instrument, Convertible, Conversion Ratio								94.3396
Debt Conversion, Converted Instrument, Amount								$ 1,000
Debt Instrument, Convertible, Conversion Price | $ / shares					$ 10.60			$ 10.60
Common Stock, Capital Shares Reserved for Future Issuance | shares					50,000,000			50,000,000
Redemption Trigger based on Company Stock Price [Member] | Convertible Debt [Member] | Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Debt Instrument, Convertible, Threshold Trading Days | d								20
Debt Instrument, Convertible, Threshold Consecutive Trading Days								30 days
Debt Instrument, Convertible, Stock Price Trigger, Percent								130.00%
Debt Instrument, Convertible, Redemption Price, Percentage								100.00%
Conversion Trigger based on Company Stock Price [Member] | Convertible Debt [Member] | Convertible Senior Notes Due 2017
Debt Instrument [Line Items]
Debt Instrument, Convertible, Threshold Trading Days | d								20
Debt Instrument, Convertible, Threshold Consecutive Trading Days								30 days
Debt Instrument, Convertible, Stock Price Trigger, Percent								130.00%
Conversion Trigger based on Company Stock Price [Member] | Convertible Debt [Member] | Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Debt Instrument, Convertible, Threshold Trading Days | d								20
Debt Instrument, Convertible, Threshold Consecutive Trading Days								30 days
Debt Instrument, Convertible, Stock Price Trigger, Percent								130.00%
Conversion Trigger based on Trading Price of Debt Versus Company Stock Price [Member] | Convertible Debt [Member] | Convertible Senior Notes Due 2017
Debt Instrument [Line Items]
Debt Instrument, Convertible, Threshold Trading Days | days								5
Debt Instrument, Convertible, Threshold Consecutive Trading Days								5 days
Debt Instrument, Convertible, Debt Price Trigger, Percent								98.00%
Conversion Trigger based on Trading Price of Debt Versus Company Stock Price [Member] | Convertible Debt [Member] | Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Debt Instrument, Convertible, Threshold Trading Days | days								5
Debt Instrument, Convertible, Threshold Consecutive Trading Days								5 days
Debt Instrument, Convertible, Debt Price Trigger, Percent								98.00%
Debt Due 2015 Exchange | Senior Notes Due 2015
Debt Instrument [Line Items]
Extinguishment of Debt, Amount										195,500,000
Debt Due 2015 Exchange | Senior Notes Due 2017
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						9.00%			9.00%
Debt Instrument, Face Amount
Gains (Losses) on Extinguishment of Debt										$ (4,000,000)
Scenario, Previously Reported [Member] | Senior Notes Due 2017
Debt Instrument [Line Items]
Long-term debt (Note 11)						$ 192,605,000			$ 192,605,000
Scenario, Previously Reported [Member] | Convertible Senior Notes Due 2017
Debt Instrument [Line Items]
Long-term debt (Note 11)						375,310,000			375,310,000
Scenario, Previously Reported [Member] | Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Long-term debt (Note 11)						342,011,000			342,011,000
Scenario, Previously Reported [Member] | Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt (Note 11)						300,000,000			300,000,000
Scenario, Previously Reported [Member] | Total Long Term Debt
Debt Instrument [Line Items]
Long-term debt (Note 11)						1,209,926,000			1,209,926,000
Accounting Standards Update 2015-03 [Member]
Debt Instrument [Line Items]
Debt Issuance Cost								$ 17,600,000
Unamortized Debt Issuance Expense					$ (17,600,000)			$ (17,600,000)
New Accounting Pronouncement, Early Adoption, Effect [Member] | Senior Notes Due 2017
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense						(2,360,000)			(2,360,000)
New Accounting Pronouncement, Early Adoption, Effect [Member] | Convertible Senior Notes Due 2017
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense						(3,974,000)			(3,974,000)
New Accounting Pronouncement, Early Adoption, Effect [Member] | Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense						(5,878,000)			(5,878,000)
New Accounting Pronouncement, Early Adoption, Effect [Member] | Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense						(5,415,000)			(5,415,000)
New Accounting Pronouncement, Early Adoption, Effect [Member] | Total Long Term Debt
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense						$ (17,627,000)			$ (17,627,000)

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