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RELATED-PARTY TRANSACTIONS (Tables)
 12 Months Ended
Dec. 31, 2015
Related Party Transactions [Abstract]  
Schedule of related party transactions
Expenses incurred by the general partner and reimbursed by us under our partnership agreement were as follows:
 
Year ended December 31,
 
2015
 
2014
 
2013
 
 
 
 
 
 
 
(In thousands)
Operation and maintenance expense
$
25,050

 
$
22,004

 
$
15,095

General and administrative expense
26,193

 
24,993

 
21,084