Note 9 - Senior Notes, Credit Facilities, and Capital Leases (Details) (USD $)	1 Months Ended		6 Months Ended				6 Months Ended
	Jun. 30, 2014	Apr. 30, 2014	Jun. 30, 2014	Feb. 28, 2014	Dec. 31, 2013	Apr. 12, 2013	Jun. 30, 2014 Senior Notes [Member]	Apr. 14, 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								$ 7,500,000		$ 500,000,000
Pension Contributions	3,000,000	2,000,000	5,000,000
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							9,000,000			10,000,000
Debt Instrument, Interest Rate, Stated Percentage										6.875%
Interest Costs Capitalized							5,600,000
Interest Expense, Debt							12,600,000
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	20,500,000		20,500,000
Capital Lease Obligations, Current	8,410,000		8,410,000		8,471,000
Capital Lease Obligations, Noncurrent	12,061,000		12,061,000		14,332,000
Capital Lease Obligations	20,471,000		20,471,000		22,800,000
Capital Leases, Future Minimum Payments Due	21,374,000		21,374,000
Capital Leases, Future Minimum Payments, Interest Included in Payments	$ 903,000		$ 903,000