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Related Party Transactions (Tables)
 3 Months Ended
Mar. 31, 2017
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions [Table Text Block]
 
Three Months Ended
 
March 31,
 
2017
 
2016
 
(In thousands)
Indirect charges:
 
 
 
Operating and maintenance expenses
$
17,506

 
$
15,966

Selling, general and administrative expenses
3,018

 
2,115

Total indirect charges
$
20,524

 
$
18,081