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GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL AND OTHER INTANGIBLE ASSETS
9 Months Ended
Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND OTHER INTANGIBLE ASSETS
GOODWILL AND OTHER INTANGIBLE ASSETS

We had no changes to the carrying amount of goodwill during the nine months ended September 30, 2013, and 2012. In the second quarter of 2013, we completed our annual goodwill impairment test, and no impairment resulted from this test.

Our intangible assets consist of contractual service agreements that provide for major maintenance and protection against unforeseen maintenance costs related to the combustion turbine generators at the Fox Energy Center. These contractual service agreements are included in other long-term assets on the balance sheet. At September 30, 2013, the gross carrying amount, accumulated amortization, and net carrying amount of these intangibles were $15.6 million, $1.2 million, and $14.4 million, respectively. The remaining amortization period at September 30, 2013, was approximately seven years. Amortization expense recorded as a component of depreciation and amortization expense in the statements of income for the three and nine months ended September 30, 2013, was $0.6 million and $1.2 million, respectively.

The following table shows our estimated amortization expense for the next five years, including amounts recorded through September 30, 2013:
 
 
For the Year Ending December 31
(Millions)
 
2013
 
2014
 
2015
 
2016
 
2017
Amortization to be recorded in depreciation and amortization expense
 
$
1.8

 
$
2.2

 
$
2.2

 
$
2.2

 
$
2.2