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Derivative Instrument and Hedging Activities (Tables)
 12 Months Ended
Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivatives Effect On Income Table
The following table summarizes the location and amount (excluding income tax effects) of derivative instrument (gains) and losses reported in the Company’s consolidated financial statements:
 
Years Ended December 31,
 
2015
 
2014
 
2013
Cash Flow Hedges:
 
 
 
 
 
Commodity contracts — Gathering and Processing:
 
 
 
 
 
Change in fair value – decrease in accumulated other comprehensive income
$
—

 
$
—

 
$
(3
)
Economic Hedges:
 
 
 
 
 
Interest rate contracts:
 
 
 
 
 
Change in fair value — increase (decrease) in interest expense
—

 
(7
)
 
29

Commodity contracts:
 
 
 
 
 
Change in fair value — decrease in deferred natural gas purchases
—

 
—

 
(7
)