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Goodwill and Intangible Assets
6 Months Ended
Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Intangible Assets
The following table summarizes the changes in the carrying amount of goodwill through June 30, 2015:
 
Domestic
Segment
 
International
Segment
 
Total
Carrying amount of goodwill, December 31, 2014
$
377,089

 
$
46,187

 
$
423,276

Currency translation adjustments

 
(2,289
)
 
(2,289
)
Acquisitions (see Note 3)
773

 

 
773

Carrying amount of goodwill, June 30, 2015
$
377,862

 
$
43,898

 
$
421,760


Intangible assets at June 30, 2015, and December 31, 2014, were as follows:
 
June 30, 2015
 
December 31, 2014
 
Customer
Relationships
 
Other
Intangibles
 
Customer
Relationships
 
Other
Intangibles
 
 
 
 
 
 
 
 
Gross intangible assets
$
123,222

 
$
2,695

 
$
125,448

 
$
3,405

Accumulated amortization
(24,905
)
 
(108
)
 
(19,773
)
 
(487
)
Net intangible assets
$
98,317

 
$
2,587

 
$
105,675

 
$
2,918


At June 30, 2015, $63.2 million in net intangible assets were held in the Domestic segment and $37.7 million were held in the International segment. Amortization expense for intangible assets was $2.4 million and $1.1 million for the three months ended June 30, 2015 and 2014 and $4.9 million and $2.2 million for the six months ended June 30, 2015 and 2014.
Based on the current carrying value of intangible assets subject to amortization, estimated amortization expense is $5.0 million for the remainder of 2015, $10.2 million for 2016, $10.0 million for 2017, $9.4 million for 2018, $9.3 million for 2019 and $9.3 million for 2020.