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Note 3 - Long-term Debt (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
June 30,
   
December 31,
 
   
2018
   
2017
 
Long-term debt :
               
2017 Senior Credit Facility
  $
632,026
    $
635,234
 
2024 Notes
   
525,000
     
525,000
 
2026 Notes
   
700,000
     
700,000
 
Total outstanding principal
   
1,857,026
     
1,860,234
 
Unamortized deferred loan costs - 2017 Senior Credit Facility
   
(10,519
)    
(11,777
)
Unamortized deferred loan costs - 2024 Notes
   
(6,244
)    
(6,743
)
Unamortized deferred loan costs - 2026 Notes
   
(8,915
)    
(9,473
)
Unamortized premium - 2026 Notes
   
4,881
     
5,187
 
Carrying value of long-term debt
   
1,836,229
     
1,837,428
 
Less current portion
   
(37,000
)    
(6,417
)
Carrying value of long-term debt, less current portion
  $
1,799,229
    $
1,831,011
 
                 
Borrowing availability under the Revolving Credit Facility
  $
100,000
    $
100,000