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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2016
Long-Term Debt [Abstract]  
Schedule of Long-Term Debt
Long-term debt at December 31, 2016 and 2015 consisted of the following (in thousands):

  
2016
  
2015
 
Long-term debt, including current portion:
      
$550,000,000 revolving credit facility due April 30, 2020
 
$
225,986
  
$
278,834
 
$150,000,000 senior notes Series A due February 27, 2020
  
150,000
   
150,000
 
$350,000,000 senior notes Series B due February 27, 2023
  
350,000
   
350,000
 
$10,000,000 credit line due June 30, 2017
  
—
   
—
 
  
$
725,986
  
$
778,834
 
Unamortized debt issuance costs
  
(3,184
)
  
(3,985
)
  
$
722,802
  
$
774,849
 
Schedule of Aggregate Payments due on the Long-Term Debt
The aggregate payments due on the long-term debt in each of the next five years were as follows (in thousands):

2017
 
$
—
 
2018
  
—
 
2019
  
—
 
2020
  
375,986
 
2021
  
—
 
Thereafter
  
350,000
 
  
$
725,986