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Note 3 - Long-term Debt - Long-term Debt Summary (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Senior Credit Facility $ 1,780,046  
Total outstanding principal 1,780,046 $ 1,781,438
Less current portion (5,564)
Net carrying value 1,748,716 1,756,747
Borrowing availability under Revolving Credit Facility 100,000 60,000
2014 Senior Credit Facility [Member]    
Senior Credit Facility 556,438
Unamortized deferred loan costs (12,158)
The 2017 Senior Credit Facility [Member]    
Senior Credit Facility 555,046 [1]
Unamortized deferred loan costs (13,609)
2024 Notes [Member]    
Senior Credit Facility 525,000  
Unsecured Debt 525,000 525,000
Unamortized deferred loan costs (7,493) (7,742)
2026 Notes [Member]    
Senior Credit Facility 700,000  
Unsecured Debt 700,000 700,000
Unamortized deferred loan costs (10,308) (10,588)
Unamortized premium $ 5,644 $ 5,797
[1] On April 3, 2017, we borrowed $85.0 million under the terms of the 2017 Incremental Term Loan. Accordingly the balance outstanding under the 2017 Senior Credit Facility increased to $640.0 million and the quarterly principal payments will increase to $1.6 million beginning on June 30, 2017.