Goodwill and Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2013
Changes in Carrying Amount of Goodwill

Changes in the carrying amount of goodwill were as follows:

 

Balance at December 31, 2011

   $ 90,008   

Additions—Power Fuels merger

     312,715   

Additions—Other acquisitions

     12,453   
  

 

 

 

Balance at December 31, 2012

     415,176   

Additions—2013 acquisitions

     341   

Acquisition adjustments, net

     (6,821 ) 
  

 

 

 

Balance at December 31, 2013

   $ 408,696   
  

 

 

 
Intangible Assets

Intangible assets consist of the following:

 


    December 31, 2013     December 31, 2012  
    Gross
Carrying
Amount
    Accumulated
Amortization
    Net     Remaining
Useful Life
    Gross
Carrying
Amount
    Accumulated
Amortization
    Net     Remaining
Useful Life
 

Customer relationships

  $ 163,106      $ (28,127 )    $ 134,979        13.6      $ 166,426      $ (8,945 )    $ 157,481        14.3   

Disposal permits

    1,819        (682 )      1,137        7.2        2,588        (472 )      2,116        8.2   

Customer contracts

    17,352        (4,105 )      13,247        13.0        17,352        (3,073 )      14,279        14.0   
 

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

 
  $ 182,277      $ (32,914 )    $ 149,363        13.4      $ 186,366      $ (12,490 )    $ 173,876        14.2   
 

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

Future Amortization Expense

As of December 31, 2013, future amortization expense of intangible assets is estimated to be:

 

2014

   $ 16,681   

2015

     15,643   

2016

     13,930   

2017

     13,310   

2018

     12,889   

Thereafter

     76,910   
  

 

 

 

Total

   $ 149,363