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Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2017
Intangible Assets  
Intangible assets

Amortization expense for the three months ended March 31, 2017 and 2016 was $3.4 million and $3.5 million, respectively. These costs are amortized to depreciation, depletion, and amortization expense in our consolidated statement of operations.  Intangible assets as of March 31, 2017 and December 31, 2016 are detailed below (in thousands):

 

 

 

 

 

 

 

 

 

 

March 31,

 

December 31, 

 

 

2017

    

2016

Beginning balance

 

$

185,766

 

$

199,741

   Disposals

 

 

 —

 

 

(219)

   Amortization

 

 

(3,412)

 

 

(13,756)

Ending balance

 

$

182,354

 

$

185,766