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Note 3 - Long-term Debt Summary (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
2014 Senior Credit Facility [Member]    
Long-term debt including current portion:    
Long-term Debt, Gross $ 980,375,000 $ 556,438,000
Unamortized deferred loan costs - Senior Credit Facility (14,255,000) (6,136,000)
2020 Notes [Member]    
Long-term debt including current portion:    
Unsecured Debt 675,000,000 675,000,000
Unamortized deferred loan costs - Senior Credit Facility (8,826,000) (9,317,000)
Unamortized premium - 2020 Notes 3,884,000 4,099,000
2014 Revolving Credit Facility [Member]    
Long-term debt including current portion:    
Borrowing availability under Revolving Credit Facility 60,000,000 50,000,000
Total outstanding principal 1,655,375,000 1,231,438,000
Less current portion (4,250,000) 0
Net carrying value $ 1,631,928,000 $ 1,220,084,000