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Long-Term Obligations and Short-Term Note Payable (Tables)
12 Months Ended
Dec. 31, 2016
Debt Disclosure [Abstract]  
Schedule of Maturities of Long-term Debt [Table Text Block]
Principal maturities of the Partnership's existing third party debt instruments for the next five years and thereafter are as follows as of December 31, 2016 (in thousands):

 
 
2017
 
2018
 
2019
 
2020
 
2021
 
Thereafter
 
Total
Second Amended and Restated Credit Agreement
 
$

 
$

 
$
392,600

 
$

 
$

 
$

 
$
392,600