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Intangibles (Net of Amortization) and Goodwill
3 Months Ended
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangibles (Net of Amortization) and Goodwill
Intangibles (Net of Amortization) and Goodwill

The net carrying amount of intangibles and goodwill was $10 million at March 31, 2016 and $11 million at December 31, 2015. The gross carrying amount and accumulated amortization of each type of intangible asset and goodwill are presented in the table below.
 
 
March 31, 2016
 
December 31, 2015
(in thousands)
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Gross
Carrying
Amount
 
Accumulated
Amortization
Amortizing intangible assets
 
 
 
 
 
 
 
 
Formulas and technology
 
$
2,823

 
$
1,771

 
$
88,763

 
$
86,861

Contracts
 
4,476

 
4,215

 
4,476

 
4,103

Customer bases
 
6,971

 
3,711

 
6,977

 
3,627

Trademarks and trade names
 
1,544

 
960

 
1,549

 
923

Goodwill
 
4,605

 
 
 
4,656

 
 
 
 
$
20,419

 
$
10,657

 
$
106,421

 
$
95,514



All of the intangibles relate to the petroleum additives segment. The change in the gross carrying amount between 2015 and 2016 is due to certain intangible assets related to formulas and technology becoming fully amortized during 2016, which resulted in a decrease of the gross carrying amount and accumulated amortization, as well as foreign currency fluctuations. There is no accumulated goodwill impairment.
Amortization expense was (in thousands):
Three months ended March 31, 2016
$
1,053

Three months ended March 31, 2015
1,427



Estimated amortization expense for the remainder of 2016, as well as annual amortization expense related to our intangible assets for the next five years, is expected to be (in thousands):
2016
$
835

2017
728

2018
698

2019
676

2020
315

2021
243



We amortize contracts over 10 years; customer bases over 20 years; formulas and technology over 10 years; and trademarks and trade names over 10 years.