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GOODWILL AND OTHER INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
GOODWILL AND OTHER INTANGIBLE ASSETS | GOODWILL AND OTHER INTANGIBLE ASSETS The following table presents the changes in the carrying amount of goodwill and other intangible assets during the year ended December 31, 2018 (in thousands):
| Goodwill |  | Other Intangible Assets |  | Total
Balances as of December 31, 2017 | $ | 187,591 |  |  | $ | 78,525 |  |  | $ | 266,116 |
Translation adjustment | — |  |  | (917 | ) |  | (917 | )
Acquisition of ASI | 6,461 |  |  | 6,185 |  |  | 12,646 |
Amortization | — |  |  | (16,586 | ) |  | (16,586 | )
Balances as of December 31, 2018 | $ | 194,052 |  |  | $ | 67,207 |  |  | $ | 261,259 |
The following table presents the changes in the carrying amount of goodwill and other intangible assets during the year ended December 31, 2017 (in thousands):
| Goodwill |  | Other Intangible Assets |  | Total
Balances as of December 31, 2016 | $ | 187,591 |  |  | $ | 94,831 |  |  | $ | 282,422 |
Translation adjustment | — |  |  | 960 |  |  | 960 |
Amortization | — |  |  | (17,266 | ) |  | (17,266 | )
Balances as of December 31, 2017 | $ | 187,591 |  |  | $ | 78,525 |  |  | $ | 266,116 |
The following table presents the goodwill balance by reportable segment as of December 31, 2018 and 2017 (in thousands):
| As of December 31,
| 2018 |  | 2017
Service Centers | $ | 160,934 |  |  | $ | 154,473 |
Innovative Pumping Solutions | 15,980 |  |  | 15,980 |
Supply Chain Services | 17,138 |  |  | 17,138 |
Total | $ | 194,052 |  |  | $ | 187,591 |
The following table presents a summary of amortization of other intangible assets ( in thousands):
| As of December 31, 2018 |  | As of December 31, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Amount, net |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Amount, net
Customer relationships | $ | 168,255 |  |  | $ | (101,200 | ) |  | $ | 67,055 |  |  | $ | 162,200 |  |  | $ | (83,806 | ) |  | $ | 78,394 |
Non-compete agreements | 784 |  |  | (632 | ) |  | 152 |  |  | 949 |  |  | (818 | ) |  | 131 |
Total | $ | 169,039 |  |  | $ | (101,832 | ) |  | $ | 67,207 |  |  | $ | 163,149 |  |  | $ | (84,624 | ) |  | $ | 78,525 |
Gross carrying amounts as well as accumulated amortization are partially affected by the fluctuation of foreign currency rates. Other intangible assets are amortized according to estimated economic benefits over their estimated useful lives. Customer relationships are amortized over their estimated useful lives. Amortization expense is recognized according to estimated economic benefits and was $16.6 million, $17.3 million, and $18.1 million for the years ended December 31, 2018, 2017, and 2016, respectively. The estimated future annual amortization of intangible assets for each of the next five years and thereafter are as follows (in thousands):
2019 | $ | 15,479 |
2020 | 12,674 |
2021 | 10,792 |
2022 | 10,091 |
2023 | 8,665 |
Thereafter | 9,506 |
Total | $ | 67,207 |
The weighted average remaining estimated life for customer relationships and non-compete agreements are 5.5 years and 3.2 years, respectively.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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