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Note 3 - Long-term Debt (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
September 30,
   
December 31,
 
   
2018
   
2017
 
Long-term debt including current portion:
               
2017 Senior Credit Facility
   
595,026
     
635,234
 
2024 Notes
   
525,000
     
525,000
 
2026 Notes
   
700,000
     
700,000
 
Total outstanding principal
   
1,820,026
     
1,860,234
 
Unamortized deferred loan costs - 2017 Senior Credit Facility
   
(9,890
)    
(11,777
)
Unamortized deferred loan costs - 2024 Notes
   
(5,994
)    
(6,743
)
Unamortized deferred loan costs - 2026 Notes
   
(8,637
)    
(9,473
)
Unamortized premium - 2026 Notes
   
4,729
     
5,187
 
Less current portion
   
-
     
(6,417
)
Net carrying value
  $
1,800,234
    $
1,831,011
 
                 
Borrowing availability under the Revolving Credit Facility
  $
100,000
    $
100,000