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Note 4 - Fair Value of Financial Instruments Other Fair Value Disclosure (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 1,230,246 $ 1,192,299
Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cost Method Investments 3,800 14,600
Long-term debt 1,230,200 1,192,300
Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cost Method Investments, Fair Value Disclosure [1] 7,600 20,500
Long-term Debt, Fair Value [1] $ 1,558,700 $ 1,859,300
[1] These estimated fair values would be classified in Level II of the fair value hierarchy.