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Note 6 - Long-term Debt (Tables)
3 Months Ended
Mar. 31, 2016
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
 
 
March 31, 2016
 
 
December 31, 2015
 
Senior Unsecured Notes
  $ 450,000     $ 450,000  
Senior Credit Facilities
    98,125       98,750  
Capital lease obligation
    298       301  
Total debt
    548,423       549,051  
Less unamortized debt issuance costs
    (9,385 )     (9,790 )
Less current portion long-term debt
    (4,375 )     (3,750 )
Total long-term debt
  $ 534,663     $ 535,511  
Schedule of Maturities of Long-term Debt [Table Text Block]
Years Ending December 31
:
 
Amount
 
2016
  $ 3,125  
2017
    6,250  
2018
    8,750  
2019
    12,500  
2020
    67,500  
Thereafter
    450,298  
Total
  $ 548,423