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Note 3 - Long-term Debt (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
September 30,
    
December 31,
  
   
2017
    
2016
  
Long-term debt including current portion:
                
2014 Senior Credit Facility
   $
-
     $
556,438
  
2017 Senior Credit Facility
    
636,838
      
-
  
2024 Notes
    
525,000
      
525,000
  
2026 Notes
    
700,000
      
700,000
  
Total outstanding principal
    
1,861,838
      
1,781,438
  
Unamortized deferred loan costs - 2014 Senior Credit Facility
    
-
      
(12,158
 )
Unamortized deferred loan costs - 2017 Senior Credit Facility
    
(12,406
 )    
-
  
Unamortized deferred loan costs - 2024 Notes
    
(6,993
 )    
(7,742
 )
Unamortized deferred loan costs - 2026 Notes
    
(9,751
 )    
(10,588
 )
Unamortized premium - 2026 Notes
    
5,339
      
5,797
  
Less current portion
    
(6,417
 )    
-
  
Net carrying value
   $
1,831,610
     $
1,756,747
  
                 
Borrowing availability under the Revolving Credit Facility
   $
100,000
     $
60,000
  
Schedule of Maturities of Long-term Debt [Table Text Block]
   
Minimum Principal Maturities
  
Year
  
2017 Senior
Credit Facility
    
2024 Notes
    
2026 Notes
    
Total
  
2017
   $
1,604
     $
-
     $
-
     $
1,604
  
2018
    
6,417
      
-
      
-
      
6,417
  
2019
    
6,417
      
-
      
-
      
6,417
  
2020
    
6,417
      
-
      
-
      
6,417
  
2021
    
6,417
      
-
      
-
      
6,417
  
Thereafter
    
609,566
      
525,000
      
700,000
      
1,834,566
  
Total
   $
636,838
     $
525,000
     $
700,000
     $
1,861,838