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Intangible Assets
 6 Months Ended
Jun. 30, 2011
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
(5) Intangible Assets
 
The Company amortizes intangible assets on a straight line basis over their estimated useful lives as follows:
 
Trademarks
                 1-10 years
Contracts - third party
                 7 years
Contracts - owned equipment
                 5-7 years
 
Total amortization expense was $0.3 million for the three months ended June 30, 2011 and 2010, and $0.7 million for the six months ended June 30, 2011 and 2010. Intangible assets as of June 30, 2011 were as follows (in thousands):
 
 
 
Gross
Carrying
Amount
 
 
Accumulated
Amortization
 
 
Net Carrying
Amount
 
Trademarks
 
$
1,282
 
 
$
(642
)
 
$
640
 
Contracts - third party
 
 
3,650
 
 
 
(2,477
)
 
 
1,173
 
Contracts - owned equipment
 
 
4,121
 
 
 
(2,934
)
 
 
1,187
 
Intangible assets
 
$
9,053
 
 
$
(6,053
)
 
$
3,000