Note 9 - Senior Notes, Credit Facilities, and Capital Leases (Details) (USD $)	9 Months Ended				9 Months Ended
	Sep. 30, 2014	Feb. 28, 2014	Dec. 31, 2013	Apr. 12, 2013	Sep. 30, 2014 Senior Notes [Member]	Jan. 31, 2014 Senior Notes [Member]	Apr. 12, 2013 Senior Notes [Member]
Note 9 - Senior Notes, Credit Facilities, and Capital Leases (Details) [Line Items]
Debt Instrument, Face Amount							$ 500,000,000
Pension Contributions	6,500,000				6,500,000
Proceeds from Issuance of Senior Long-term Debt	490,000,000
Percentage Of Notes Tendered For Exchange						99.99%
Underwriting Discount on Senior Notes				2.00%
Debt Instrument, Unamortized Discount					8,300,000		10,000,000
Debt Instrument, Interest Rate, Stated Percentage							6.875%
Interest Costs Capitalized					8,600,000
Interest Expense, Debt					18,600,000
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed					100.00%
Percentage of Notes Redeemable					35.00%
Debt Instrument, Redemption Price, Percentage					101.00%
Line of Credit Facility, Maximum Borrowing Capacity		100,000,000
Capital Leases Including Purchase Option	19,400,000
Capital Lease Obligations, Current	8,470,000		8,471,000
Capital Lease Obligations, Noncurrent	10,890,000		14,332,000
Capital Lease Obligations	19,362,000		22,800,000
Capital Leases, Future Minimum Payments Due	20,190,000
Capital Leases, Future Minimum Payments, Interest Included in Payments	$ 828,000