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Intangible Assets
6 Months Ended
Jun. 30, 2018
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets
Intangible Assets
 
The gross amount, accumulated amortization and net carrying amount of intangible assets were as follows:
 
 
 
 
June 30, 2018
 
December 31, 2017
 
Useful Life
(Years)
 
Gross
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
Gross
Amount
 
Accumulated
Amortization
 
Impairment
 
Net
Carrying
Amount
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Customer relationships
5-14
 
$
112,847

 
$
(60,862
)
 
$
51,985

 
$
113,299

 
$
(58,107
)
 
$
(170
)
 
$
55,022

Software/Technology
3-15
 
17,267

 
(14,675
)
 
2,592

 
19,523

 
(14,133
)
 
(2,411
)
 
2,979

Covenants not to compete
2-5
 
12,338

 
(10,773
)
 
1,565

 
12,510

 
(10,438
)
 

 
2,072

Other
2-12
 
9,971

 
(6,942
)
 
3,029

 
10,109

 
(6,411
)
 
(32
)
 
3,666

Total
 
 
$
152,423

 
$
(93,252
)
 
$
59,171

 
$
155,441

 
$
(89,089
)
 
$
(2,613
)
 
$
63,739


 
Amortization expense for the three months ended June 30, 2018 and June 30, 2017 was $2.5 million and $2.3 million, respectively.

Amortization expense for the six months ended June 30, 2018 and June 30, 2017 was $5.0 million and $4.4 million, respectively.