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Note 3 - Long-term Debt (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
 
 
June 30,
 
 
December 31,
 
 
 
2017
 
 
2016
 
Long-term debt including current portion:
                
2014 Senior Credit Facility
   $
-
    $
556,438
 
2017 Senior Credit Facility
    
638,443
     
-
 
2024 Notes
    
525,000
     
525,000
 
2026 Notes
    
700,000
     
700,000
 
Total outstanding principal
    
1,863,443
     
1,781,438
 
Unamortized deferred loan costs - 2014 Senior Credit Facility
    
-
     
(12,158
 )
Unamortized deferred loan costs - 2017 Senior Credit Facility
    
(13,047
 )    
-
 
Unamortized deferred loan costs - 2024 Notes
    
(7,243
 )    
(7,742
 )
Unamortized deferred loan costs - 2026 Notes
    
(10,031
 )    
(10,588
 )
Unamortized premium - 2026 Notes
    
5,492
     
5,797
 
Less current portion
    
(6,417
 )    
-
 
Net carrying value
   $
1,832,197
    $
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
   $
3,208
    $
-
    $
-
    $
3,208
 
2018
    
6,417
     
-
     
-
     
6,417
 
2019
    
6,417
     
-
     
-
     
6,417
 
2020
    
6,417
     
-
     
-
     
6,417
 
2021
    
6,417
     
-
     
-
     
6,417
 
Thereafter
    
609,567
     
525,000
     
700,000
     
1,834,567
 
Total
   $
638,443
    $
525,000
    $
700,000
    $
1,863,443