Note 3 - Long-term Debt (Details) (USD $)	9 Months Ended		0 Months Ended			0 Months Ended	3 Months Ended					0 Months Ended	3 Months Ended											6 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 15, 2014 Amended [Member] 2014 Revolving Credit Facility [Member]	Jun. 13, 2014 2014 Senior Credit Facility [Member]	Sep. 30, 2014 2014 Senior Credit Facility [Member]	Sep. 15, 2014 2014 Term Loan [Member] 2014 Revolving Credit Facility [Member]	Sep. 15, 2014 2014 Term Loan [Member] Base Rate [Member] Minimum [Member]	Sep. 15, 2014 2014 Term Loan [Member] Base Rate [Member] Maximum [Member]	Sep. 15, 2014 2014 Term Loan [Member] London Interbank Offered Rate (LIBOR) [Member] Minimum [Member]	Sep. 15, 2014 2014 Term Loan [Member] London Interbank Offered Rate (LIBOR) [Member] Maximum [Member]	Sep. 15, 2014 2014 Term Loan [Member] Minimum LIBOR Floor [Member]	Jun. 13, 2014 2014 Term Loan [Member]	Sep. 15, 2014 2014 Term Loan [Member]	Sep. 15, 2014 2014 Revolving Credit Facility [Member] Base Rate [Member] Minimum [Member]	Sep. 15, 2014 2014 Revolving Credit Facility [Member] Base Rate [Member] Maximum [Member]	Sep. 15, 2014 2014 Revolving Credit Facility [Member] London Interbank Offered Rate (LIBOR) [Member] Minimum [Member]	Sep. 15, 2014 2014 Revolving Credit Facility [Member] London Interbank Offered Rate (LIBOR) [Member] Maximum [Member]	Sep. 15, 2014 2014 Revolving Credit Facility [Member] Plus Overnight Federal Funds Rate [Member]	Sep. 15, 2014 2014 Revolving Credit Facility [Member] Plus One-Month LIBOR [Member]	Sep. 15, 2014 2014 Revolving Credit Facility [Member] Minimum [Member]	Sep. 15, 2014 2014 Revolving Credit Facility [Member] Maximum [Member]	Sep. 30, 2014 2014 Revolving Credit Facility [Member]	Jun. 13, 2014 2014 Revolving Credit Facility [Member]	Jun. 30, 2014 2012 Senior Credit Facility [Member]	Dec. 31, 2013 2012 Senior Credit Facility [Member]	Sep. 30, 2014 2020 Notes [Member]	Dec. 31, 2013 2020 Notes [Member]	Sep. 30, 2014 Excalibur Loan [Member]	Dec. 31, 2013 Excalibur Loan [Member]	Sep. 30, 2014 2014 Revolving Credit Facility [Member]
Note 3 - Long-term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 625,000,000	$ 575,000,000																			$ 50,000,000
Long-term Debt	1,306,500,000	842,900,000										525,000,000
Proceeds from Issuance of Long-term Debt	644,000,000											525,000,000
Proceeds from Lines of Credit						100,000,000
Debt Instrument, Basis Spread on Variable Rate							1.75%	2.00%	2.75%	3.00%	0.75%			1.00%	1.50%	2.00%	2.50%	0.50%	1.00%
Debt Instrument, Periodic Principal Payment, Principal													0.25%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage																				0.375%	0.50%
Long-term Line of Credit					623,438,000																	623,400,000			159,000,000
Line of Credit Facility, Interest Rate at Period End																						3.80%			4.80%
Letters of Credit Outstanding, Amount																						10,000,000								10,000,000
Line of Credit Facility, Remaining Borrowing Capacity					40,000,000																				30,000,000
Deferred Finance Costs, Net					7,500,000																					11,800,000	13,200,000	200,000	200,000
Debt Issuance Cost			2,000,000	7,100,000
Gains (Losses) on Extinguishment of Debt	(4,897,000)																							(4,900,000)
Unsecured Debt																										675,000,000	675,000,000
Debt Instrument, Interest Rate, Effective Percentage																										7.50%	7.30%	4.00%	4.75%
Long-term Debt, Gross																												$ 2,850,000	$ 3,000,000