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Related Party Transactions (Tables)
 3 Months Ended
Mar. 31, 2016
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions [Table Text Block]
 
Three Months Ended
 
March 31,
 
2016
 
2015
 
(In thousands)
Indirect charges:
 
 
 
Operating and maintenance expenses
$
10,209

 
$
9,007

Selling, general and administrative expenses
1,816

 
1,983

Total indirect charges
$
12,025

 
$
10,990