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GOODWILL AND OTHER INTANGIBLE ASSETS
12 Months Ended
Dec. 31, 2013
GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract]  
GOODWILL AND OTHER INTANGIBLE ASSETS
NOTE 7 - 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, 2013 (in thousands):

 
Goodwill
 
Other
Intangible Assets
 
Total
      
Balance as of December 31, 2012
$ 145,788
 
$ 63,189
 
$ 208,977
Acquired during the period
39,898
 
22,033
 
61,931
Adjustments to prior period estimates
2,424
 
(2,424)
 
-
Translation adjustment
-
 
(1,246)
 
(1,246)
Amortization
-
 
(11,830)
 
(11,830)
Balance as of December 31, 2013
$ 188,110
 
$ 69,722
 
$ 257,832

During the year, the Company reduced customer lists from our HSE acquisition by approximately $2.3 million based on a valuation specialists’ report. This resulted in an increase in goodwill. There were other insignificant changes to prior year estimates.

The following table presents the changes in the carrying amount of goodwill and other intangible assets during the year ended December 31, 2012 (in thousands):
 
 
Goodwill
 
Other
Intangible Assets
 
Total
           
Balance as of December 31, 2011
$  101,764
 
$ 43,194
 
$ 144,958
Acquired during the year
44,074
 
30,643
 
74,717
Adjustments to prior year estimates
(50)
 
50
 
-
Translation adjustment
-
 
188
 
188
Amortization
-
 
(10,886)
 
(10,886)
Balance as of December 31, 2012
$ 145,788
 
$ 63,189
 
$ 208,977

The following table presents goodwill balance by reportable segment as of December 31, 2013 and 2012 (in thousands):

 
As of December 31,
2013
 
2012
Service Centers
$  142,714
 
$  112,670
Innovative Pumping Solutions
28,258
 
15,980
Supply Chain Services
17,138
 
17,138
Total
$  188,110
 
$  145,788

The following table presents a summary of amortizable other intangible assets (in thousands):

 
As of December 31, 2013
 
As of December 31, 2012
 
Gross
Carrying
Amount
 
 
Accumulated
Amortization
 
Carrying Amount, net
 
Gross
Carrying
Amount
 
 
Accumulated
Amortization
 
Carrying Amount, net
Vendor agreements
$    2,496
 
$   (1,205)
 
$    1,291
 
$    2,496
 
$   (1,081)
 
$    1,415
Customer relationships
109,897
 
(42,468)
 
67,429
 
90,851
 
(30,010)
 
60,841
Non-compete agreements
1,739
 
(737)
 
1,002
 
1,541
 
(608)
 
933
Total
$ 114,132
 
$ (44,410)
 
$  69,722
 
$ 94,888
 
$ (31,699)
 
$  63,189

Other intangible assets are generally amortized on a straight-line basis over their estimated useful lives. Amortization expense was $11.8 million, $10.9 million, and $6.6 million for the years ended December 31, 2013, 2012, and 2011, respectively.  The estimated future annual amortization of intangible assets for each of the next five years and thereafter are as follows (in thousands):

2014
12,966
2015
11,532
2016
9,172
2017
9,089
2018
8,354
Thereafter
18,609

The weighted average remaining estimated life for vendor agreements, customer relationships, and non-compete agreements are 11.9 years, 7.1 years, and 3.4 years, respectively.