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Long-Term Debt (Tables)
12 Months Ended
Dec. 31, 2015
Long-Term Debt [Abstract]  
Schedule of Long-Term Debt
Long-term debt at December 31, 2015 and 2014 consisted of the following (in thousands):

  
2015
  
2014
 
Long-term debt, including current portion:
    
$550,000,000 revolving credit facility due April 30, 2020
 
$
278,834
  
$
 
    $325,000,000 revolving credit facility due November 9, 2015  
— 
   116,700 
$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
  
   
 
$540,000,000 term loan due July 1, 2016
  
   
100,000
 
  
$
778,834
  
$
716,700
 
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):
   
2016
 
$
 
2017
  
 
2018
  
 
2019
  
 
2020
  
428,834
 
Thereafter
  
350,000
 
  
$
778,834