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Note 8 - Long-term Debt (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
March 31, 2018
   
December 31, 2017
 
Notes
  $
450,000
    $
450,000
 
Senior Credit Facilities
   
741,563
     
744,375
 
Capital lease obligation
   
263
     
267
 
Total debt
   
1,191,826
     
1,194,642
 
Less unamortized debt issuance costs
   
(18,615
)    
(19,585
)
Less current portion
   
(15,938
)    
(14,375
)
Total long-term debt
  $
1,157,273
    $
1,160,682
 
Schedule of Maturities of Long-term Debt [Table Text Block]
Year Ending December 31,
 
Amount
 
2018 (remaining nine months)
  $
11,575
 
2019
   
20,642
 
2020
   
26,892
 
2021
   
30,017
 
2022
   
180,017
 
Thereafter
   
922,683
 
Total
  $
1,191,826