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Intangible Assets
 9 Months Ended
Sep. 30, 2014
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets
Intangible Assets

Our identifiable intangible assets primarily consist of acquired permits and leasehold agreements and franchise agreements which grant us the right to operate out-of-home structures in specified locations and the right to provide advertising space on railroad and municipal transit properties. Identifiable intangible assets are amortized on a straight-line basis over their estimated useful life, which is the respective life of the agreement that in some cases includes historical experience of renewals.

Our identifiable intangible assets consist of the following:
(in millions)
 
Gross
 
Accumulated Amortization
 
Net
As of September 30, 2014:
 
 
 
 
 
 
Permits and leasehold agreements
 
$
876.0

 
$
(681.0
)
 
$
195.0

Franchise agreements
 
442.1

 
(317.9
)
 
124.2

Other intangible assets
 
2.1

 
(1.2
)
 
0.9

Total intangible assets
 
$
1,320.2

 
$
(1,000.1
)
 
$
320.1

 
 
 
 
 
 
 
As of December 31, 2013:
 
 
 
 
 
 
Permits and leasehold agreements
 
$
880.6

 
$
(659.0
)
 
$
221.6

Franchise agreements
 
462.4

 
(320.7
)
 
141.7

Other intangible assets
 
2.1

 
(1.0
)
 
1.1

Total intangible assets
 
$
1,345.1

 
$
(980.7
)
 
$
364.4



All of our intangible assets, except goodwill, are subject to amortization. Amortization expense was $22.8 million for the three months ended September 30, 2014, and $22.6 million for the three months ended September 30, 2013, which includes the amortization of direct lease acquisition costs of $8.8 million for the three months ended September 30, 2014, and $7.2 million for the three months ended September 30, 2013. Amortization expense was $67.3 million for the nine months ended September 30, 2014, and $68.2 million for the nine months ended September 30, 2013, which includes the amortization of direct lease acquisition costs of $24.2 million for the nine months ended September 30, 2014, and $22.7 million for the nine months ended September 30, 2013. Direct lease acquisition costs are amortized on a straight-line basis over the related customer lease term, which generally ranges from four weeks to one year.