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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
Goodwill
There were no changes in the carrying amount of goodwill for the nine months ended September 30, 2013. Goodwill is reviewed annually for impairment and more frequently if potential impairment indicators exist. No impairment indications were identified during any of the periods presented.
Other Intangible Assets
The following table presents the components of other intangible assets as of September 30, 2013 and December 31, 2012.
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
 
Useful Lives
 
(Amounts in thousands)
 
(in years)
As of September 30, 2013:
 
 
 
 
 
 
 
Customer relationships
$
51,755

 
$
(23,266
)
 
$
28,489

 
11
Trade names
15,400

 
(3,048
)
 
12,352

 
24
Technology
4,300

 
(2,043
)
 
2,257

 
10
Favorable leases
1,725

 
(1,725
)
 
0

 
3
Software
550

 
(550
)
 
0

 
2
Total intangible assets, net
$
73,730

 
$
(30,632
)
 
$
43,098

 
 
 
 
 
 
 
 
 
 
As of December 31, 2012:
 
 
 
 
 
 
 
Customer relationships
$
51,755

 
$
(19,585
)
 
$
32,170

 
11
Trade names
15,400

 
(2,567
)
 
12,833

 
24
Technology
4,300

 
(1,720
)
 
2,580

 
10
Favorable leases
1,725

 
(1,719
)
 
6

 
3
Software
550

 
(550
)
 
0

 
2
Total intangible assets, net
$
73,730

 
$
(26,141
)
 
$
47,589

 
 

Intangible assets are amortized on a straight-line basis over their useful lives. Intangible assets amortization expense was $1.5 million for the three months ended September 30, 2013 and 2012, and $4.5 million and $4.6 million for the nine months ended September 30, 2013 and 2012, respectively. The following table presents the estimated future amortization expenses related to intangible assets as of September 30, 2013:
 
Year Ending
 
Amortization Expense
 
 
(Amounts in thousands)
Remainder of 2013
 
$
1,495

2014
 
5,980

2015
 
5,980

2016
 
5,980

2017
 
5,253

Thereafter
 
18,410

Total
 
$
43,098