Note 9 - Senior Notes, Credit Facilities and Capital Leases (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Feb. 28, 2014	Jan. 06, 2014	Dec. 31, 2013	Apr. 12, 2013	Apr. 11, 2014 Subsequent Event [Member] Amount Contributed on April 14, 2014 [Member]	Apr. 14, 2014 Subsequent Event [Member]
Note 9 - Senior Notes, Credit Facilities and Capital Leases (Details) [Line Items]
Debt Instrument, Face Amount					$ 500,000,000	$ 2,000,000	$ 7,500,000
Underwriting Discount on Senior Notes					2.00%
Debt Instrument, Unamortized Discount	9,000,000				10,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.875%		6.875%
Interest Costs Capitalized	2,700,000
Interest Expense, Debt	6,300,000
Proceeds from Issuance of Senior Long-term Debt	490,000,000
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed	100.00%
Percentage of Notes Redeemable	35.00%
Debt Instrument, Redemption Price, Percentage	101.00%
Percentage Of Notes Tendered For Exchange	99.99%
Line of Credit Facility, Maximum Borrowing Capacity		100,000,000
Capital Leases Including Purchase Option	22,600,000
Capital Lease Obligations, Current	8,482,000			8,471,000
Capital Lease Obligations, Noncurrent	14,112,000			14,332,000
Capital Lease Obligations	22,530,000			22,800,000
Capital Leases, Future Minimum Payments Due	23,584,000
Capital Leases, Future Minimum Payments, Interest Included in Payments	$ 1,054,000