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Intangible Assets
 12 Months Ended
Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Assets
Activity related to intangible assets, net consisted of the following:
 
Contracts
 
Customer
Relations
 
Trade Names
 
Permits and
Licenses
 
Total
Predecessor
 
 
 
 
 
 
 
 
 
Balance at January 1, 2010
$
126,332

 
$
35,362

 
$
30,508

 
$
5,092

 
$
197,294

Amortization
(3,322
)
 
(817
)
 
(975
)
 
(214
)
 
(5,328
)
Balance at May 25, 2010
$
123,010

 
$
34,545

 
$
29,533

 
$
4,878

 
$
191,966

 
Customer
Relations
 
Trade Names
 
Total
 
 
 
 
Successor
 
 
 
 
 
 
 
 
 
Balance at May 26, 2010
$
600,860

 
$
65,500

 
$
666,360

 
 
 
 
Additions
119,379

 
—

 
119,379

 
 
 
 
Amortization
(13,673
)
 
(1,911
)
 
(15,584
)
 
 
 
 
Balance at December 31, 2010
706,566

 
63,589

 
770,155

 
 
 
 
Amortization
(25,998
)
 
(3,274
)
 
(29,272
)
 
 
 
 
Balance at December 31, 2011
$
680,568

 
$
60,315

 
$
740,883

 
 
 
 

The average remaining amortization periods for customer relations and trade names are 26 and 18 years, respectively. The expected amortization of the intangible assets for each of the five succeeding years is $29.3 million.