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GOODWILL AND OTHER INTANGIBLE ASSETS
3 Months Ended
Mar. 31, 2014
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 three months ended March 31, 2014, and 2013.

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.
 
 
March 31, 2014
 
December 31, 2013
(Millions)
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Amortized intangible assets
 
 
 
 
 
 
 
 
 
 
 
 
Contractual service agreements *
 
$
15.6

 
$
(2.4
)
 
$
13.2

 
$
15.6

 
$
(1.8
)
 
$
13.8



*
The remaining amortization period for these intangible assets at March 31, 2014, was approximately six years.

Amortization expense recorded as a component of depreciation and amortization expense in the statements of income for the three months ended March 31, 2014, was $0.6 million. An insignificant amount of amortization expense was recorded during the three months ended March 31, 2013.

The following table shows our estimated amortization expense for the next five years, including amounts recorded through March 31, 2014:
 
 
For the Year Ending December 31
(Millions)
 
2014
 
2015
 
2016
 
2017
 
2018
Amortization to be recorded in depreciation and amortization expense
 
$
2.2

 
$
2.2

 
$
2.2

 
$
2.2

 
$
2.2