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Note 3 - Long-Term Debt (Details) - Long-Term Debt (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Total long-term debt	$ 500,000	$ 500,000
Debt Premium	933	999
Total	500,933	500,999
Senior Notes Due Two Thousand Twenty Two [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 500,000	$ 500,000

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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