Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2017

Intangible Assets

Intangible assets

Amortization expense for the six months ended June 30, 2017 and 2016 was $6.8 million and $6.9 million, respectively. These costs are amortized to depreciation, depletion, and amortization expense in our consolidated statement of operations.  Intangible assets as of June 30, 2017, and December 31, 2016 are detailed below (in thousands):

	June 30,		December 31,
	2017		2016
Beginning balance	$	185,766	$	199,741
Disposals		—		(219)
Amortization		(6,824)		(13,756)
Ending balance	$	178,942	$	185,766