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Goodwill and Intangible Assets
12 Months Ended
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets

8. Goodwill and Intangible Assets

As of December 31, the gross and net amounts of acquired intangible assets were as follows:
 
 
 
 
Goodwill
 
Strategic Marketing Services
 
Performance Marketing Services
 
Total
Balance as of December 31, 2011
 
$
389,525
 
 
$
215,719
 
 
$
605,244
 
Acquired goodwill
 
 
93,531
 
 
 
19,873
 
 
 
113,404
 
Acquisition purchase price adjustments
 
 
(78
 
 
(223
 
 
(301
Foreign currency translation
 
 
782
 
 
 
942
 
 
 
1,724
 
Balance as of December 31, 2012
 
$
483,760
 
 
$
236,311
 
 
$
720,071
 
Acquired goodwill
 
 
 
 
 
35,956
 
 
 
35,956
 
Discontinued operations
 
 
(3,981
 
 
(2,493
 
 
(6,474
Foreign currency translation
 
 
(2,374
 
 
(2,846
 
 
(5,220
Balance as of December 31, 2013
 
$
477,405
 
 
$
266,928
 
 
$
744,333
 
 
 
 
 
For the Year Ended December 31,
  
 
2013
 
2012
Intangibles:
 
 
  
 
 
 
  
 
Trademarks (indefinite life)
 
$
17,780
 
 
$
17,780
 
Customer relationships – gross
 
$
92,640
 
 
$
104,070
 
Less accumulated amortization
 
 
(62,906
 
 
(66,108
Customer relationships – net
 
$
29,734
 
 
$
37,962
 
Other intangibles – gross
 
$
17,064
 
 
$
20,908
 
Less accumulated amortization
 
 
(8,316
 
 
(13,407
Other intangibles – net
 
$
8,748
 
 
$
7,501
 
Total intangible assets
 
$
127,484
 
 
$
142,758
 
Less accumulated amortization
 
 
(71,222
 
 
(79,515
Total intangible assets – net
 
$
56,262
 
 
$
63,243
 
See Note 4 for Accounting for Business Combinations.
The total accumulated impairment charges are $31,319 through December 31, 2013.
The weighted average amortization periods for customer relationships are 5 years and other intangible assets are 8 years. In total, the weighted average amortization period is 6 years. The amortization expense of amortizable intangible assets for the year ended December 31, 2013, was $18,908 (2012 – $26,575; 2011 – $21,997) the estimated amortization expense for the five succeeding years is:
 
 
Year
 
Amortization
2014
 
$
13,833
 
2015
 
$
9,199
 
2016
 
$
6,277
 
2017
 
$
2,912
 
2018
 
$
1,352