Note 12 - Long-Term Debt Schedule of Long Term Debt (Details)	1 Months Ended			2 Months Ended	3 Months Ended																	10 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($) $ / shares shares	Jun. 30, 2015 USD ($) shares	May 31, 2014 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2016 USD ($) $ / shares shares		Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	[1]	Jun. 30, 2016 USD ($)	[1]	Mar. 31, 2016 USD ($) $ / shares		Dec. 31, 2015 USD ($)		Sep. 30, 2015 USD ($)	[1]	Jun. 30, 2015 USD ($)		Mar. 31, 2015 USD ($)	[1]	Dec. 31, 2013 USD ($)	Dec. 31, 2016 USD ($) days d $ / shares shares	Dec. 31, 2015 USD ($)		Dec. 31, 2014 USD ($)	Aug. 12, 2016 USD ($)	Mar. 31, 2013 USD ($)	Nov. 30, 2010 USD ($)	Nov. 15, 2010 USD ($)
Debt Instrument [Line Items]
Long-term debt					$ 1,069,537,000									$ 1,219,454,000									$ 1,069,537,000	$ 1,219,454,000
Loss on induced conversion and debt extinguishment					$ 0	[1]		$ (17,397,000)		$ (2,108,000)		$ (55,570,000)	[1]	(2,320,000)	[1]	$ (11,000)		$ (91,876,000)	[1]	$ 0			$ (75,075,000)	(94,207,000)	[1]	$ 0
Senior Notes Due 2017
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					9.00%																		9.00%
Long-term debt					$ 0									192,261,000									$ 0	192,261,000
Debt Instrument, Repurchased Face Amount																											$ 195,500,000
Loss on induced conversion and debt extinguishment							$ (15,000,000)
Repayments of Senior Debt							$ 211,300,000
Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			5.50%		5.50%																		5.50%
Long-term debt					$ 296,907,000									295,751,000									$ 296,907,000	295,751,000
Debt Instrument, Face Amount			$ 300,000,000
Proceeds from Issuance of Long-term Debt			$ 293,800,000
Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.25%			5.25%													5.25%					5.25%
Long-term debt					$ 345,308,000									344,113,000									$ 345,308,000	344,113,000
Debt Instrument, Face Amount		$ 350,000,000																$ 350,000,000
Proceeds from Issuance of Long-term Debt		343,300,000
Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.00%				7.00%							7.00%											7.00%
Long-term debt					$ 344,362,000									0									$ 344,362,000	0
Debt Instrument, Face Amount	$ 350,000,000											$ 350,000,000
Proceeds from Issuance of Long-term Debt	343,400,000
Convertible Senior Notes Due 2017
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					3.00%																		3.00%
Long-term debt					$ 20,947,000									46,115,000									$ 20,947,000	46,115,000
Repayments of Convertible Debt		126,800,000
Extinguishment of Debt, Amount		$ 389,100,000
Debt Conversion, Converted Instrument, Shares Issued | shares		28,400,000
Gain (Loss) on Repurchase of Debt Instrument		$ (91,900,000)
Induced Conversion of Convertible Debt Expense		35,500,000
Loss on induced conversion and debt extinguishment		(52,300,000)
Write off of Deferred Debt Issuance Cost		$ 4,100,000
Convertible Debt, Termination of Capped Call Transaction, Number of Shares Received | shares		2,300,000
Convertible Debt, Termination of Capped Call Transaction, Total Consideration	$ 2,600,000	$ 54,900,000
Convertible Debt, Termination of Capped Call Transaction, Closing Stock Price | $ / shares	$ 11.86											$ 11.86
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					$ 62,013,000									341,214,000									$ 62,013,000	341,214,000
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage																							100.00%
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%
Debt Instrument, Basis Spread on Variable Rate																							0.50%
Convertible Debt [Member]
Debt Instrument [Line Items]
Repayments of Convertible Debt																							$ 235,000,000
Debt Conversion, Converted Instrument, Shares Issued | shares																							17,000,000
Gain (Loss) on Repurchase of Debt Instrument																							$ (60,100,000)
Induced Conversion of Convertible Debt Expense																							41,800,000
Loss on induced conversion and debt extinguishment																							(17,200,000)
Write off of Deferred Debt Issuance Cost																							1,100,000
Convertible Debt, Termination of Capped Call Transaction, Number of Shares Received | shares	200,000
Convertible Debt [Member] | Convertible Senior Notes Due 2017
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage																													3.00%
Long-term debt					$ 20,947,000									46,115,000									20,947,000	46,115,000
Debt Instrument, Repurchased Face Amount					30,100,000																		30,100,000
Long-term Debt, Gross					$ 22,233,000									52,370,000									$ 22,233,000	52,370,000
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					13,000,000																		13,000,000
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
Debt Instrument, Convertible, Carrying Amount of Equity Component					$ 5,000,000									11,300,000									$ 5,000,000	11,300,000					$ 101,000,000
Convertible Debt [Member] | Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage																												2.25%
Long-term debt					62,013,000									341,214,000									62,013,000	341,214,000
Debt Instrument, Repurchased Face Amount					322,000,000																		322,000,000
Long-term Debt, Gross					68,024,000									389,992,000									68,024,000	389,992,000
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, Carrying Amount of Equity Component					$ 13,100,000									$ 75,100,000									$ 13,100,000	$ 75,100,000				$ 77,000,000
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 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%

[1] For all periods presented, reflects changes to align our segment reporting structure with recent changes in personnel reporting lines and management oversight related to contract underwriting performed on behalf of third parties. Revenue and expenses for this business are now reflected in the Services segment. As a result, for all periods presented, Services revenue and cost of services have increased, with offsetting reductions in other operating expenses.