Intangible Assets

12 Months Ended

Dec. 31, 2017

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Intangible assets consist of the following:



	Weighted average remaining useful life as of December 31, 2017 (months)	As of December 31, 2017		As of December 31, 2016
		As of December 31, 2017		As of December 31, 2016
Amortizable intangible assets, net:
Customer relationships (net of accumulated amortization of $12,715 and $8,548, respectively)	160	$	24,168	28,335
Trade names (net of accumulated amortization of $2,498 and $1,653, respectively)	89	9,074		9,919
Computer software (net of accumulated amortization of $10,013 and $5,675, respectively)	14	4,958		9,296
Covenants not to compete (net of accumulated amortization of $127 and $91, respectively)	77	227		263
Total - amortizable intangible assets, net	124	$	38,427	47,813

The Company recorded amortization expense on its intangible assets of $9.4 million, $11.6 million, and $9.8 million during the years ended December 31, 2017, 2016, and 2015, respectively. The Company will continue to amortize intangible assets over their remaining useful lives. As of December 31, 2017, the Company estimates it will record amortization expense as follows:



2018	$	10,428
2019	6,990
2020	3,789
2021	3,077
2022	2,474
2023 and thereafter	11,669
	$	38,427