Note 3 - Long-term Debt (Details) (USD $)	12 Months Ended			21 Months Ended		12 Months Ended				1 Months Ended		12 Months Ended		12 Months Ended		1 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended					12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2015 Scenario, Forecast [Member] Certain Equity Offering [Member] Maximum [Member] 2020 Notes [Member]	Sep. 30, 2015 Scenario, Forecast [Member] 2020 Notes [Member]	Dec. 31, 2013 London Interbank Offered Rate (LIBOR) [Member] 2012 Term Loan [Member]	Dec. 31, 2013 London Interbank Offered Rate (LIBOR) [Member] Excalibur Loan [Member]	Dec. 31, 2013 Federal Funds Rate [Member] Excalibur Loan [Member]	Dec. 31, 2013 2012 Senior Credit Facility [Member] Revolving Credit Facility [Member]	Oct. 18, 2013 2012 Senior Credit Facility [Member] 2012 Term Loan [Member]	Dec. 31, 2013 2012 Senior Credit Facility [Member] 2012 Term Loan [Member]	Dec. 31, 2012 2012 Senior Credit Facility [Member]	Dec. 31, 2013 2012 Senior Credit Facility [Member]	Dec. 31, 2013 Excalibur Loan [Member]	Jul. 31, 2013 Excalibur Loan [Member]	Oct. 18, 2013 2020 Notes [Member]	Dec. 31, 2012 2020 Notes [Member]	Dec. 31, 2013 2020 Notes [Member]	Oct. 18, 2013 2020 Additional Notes [Member]	Dec. 31, 2013 2020 Additional Notes [Member]	Dec. 31, 2012 2015 Notes [Member]	Dec. 31, 2013 2012 Senior Credit Facility [Member]	Dec. 31, 2012 2012 Senior Credit Facility [Member]	Dec. 31, 2013 Revolving Credit Facility [Member]	Dec. 31, 2013 Minimum [Member] Base Rate [Member] 2012 Senior Credit Facility [Member]	Dec. 31, 2013 Minimum [Member] Base Rate [Member] 2012 Term Loan [Member]	Dec. 31, 2013 Minimum [Member] London Interbank Offered Rate (LIBOR) [Member] 2012 Senior Credit Facility [Member]	Dec. 31, 2013 Minimum [Member] London Interbank Offered Rate (LIBOR) [Member] 2012 Term Loan [Member]	Dec. 31, 2013 Minimum [Member] 2012 Senior Credit Facility [Member]	Dec. 31, 2013 Maximum [Member] Base Rate [Member] 2012 Senior Credit Facility [Member]	Dec. 31, 2013 Maximum [Member] Base Rate [Member] 2012 Term Loan [Member]	Dec. 31, 2013 Maximum [Member] London Interbank Offered Rate (LIBOR) [Member] 2012 Senior Credit Facility [Member]	Dec. 31, 2013 Maximum [Member] London Interbank Offered Rate (LIBOR) [Member] 2012 Term Loan [Member]	Dec. 31, 2013 Maximum [Member] Revolving Loan [Member]
Note 3 - Long-term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity									$ 40,000,000		$ 555,000,000
Line of Credit Facility, Amount Outstanding												535,000,000	159,000,000										535,000,000
Line of Credit Facility, Interest Rate at Period End													4.80%
Deferred Finance Costs, Net												4,600,000		200,000			7,100,000	13,200,000				3,900,000
Debt Instrument, Basis Spread on Variable Rate																									1.00%	2.50%	2.00%	3.50%		1.50%	2.75%	2.50%	3.75%
Debt Instrument, Basis Spread on Variable Rate, Floor						1.00%
Debt Instrument, Basis Spread on Variable Rate, Base Rate Calculation							1.00%	0.50%
Line of Credit Facility, Commitment Fee Percentage																													0.375%					0.50%
Letters of Credit Outstanding, Amount													10,000,000
Line of Credit Facility, Remaining Borrowing Capacity	30,000,000	40,000,000																						30,000,000
Unsecured Debt																	300,000,000	675,000,000
Debt Instrument, Interest Rate, Effective Percentage														4.75%			7.30%	7.50%
Debt Instrument, Face Amount															3,000,000				375,000,000
Debt Instrument, Redemption Price, Percentage				35.00%	100.00%														102.125%
Proceeds from Unsecured Notes Payable																383,000,000
Repayments of Senior Debt										376,000,000
Long-term Debt, Gross	837,048,000												159,000,000	3,000,000				675,000,000
Interest Expense, Debt	52,445,000	59,443,000	61,777,000											30,000
Gains (Losses) on Extinguishment of Debt		(46,683,000)										(8,100,000)									(38,600,000)
Debt Issuance Cost												9,900,000					7,300,000			7,300,000
Proceeds from Debt, Net of Issuance Costs																	290,900,000
Interest Paid	$ 49,400,000	$ 53,300,000	$ 57,400,000