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Goodwill and Related Intangible Assets
3 Months Ended
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Related Intangible Assets
GOODWILL AND RELATED INTANGIBLE ASSETS
Goodwill
The changes in the carrying amount of goodwill for the three months ended March 31, 2016 are as follows (in thousands):
 
Residential
Products
 
Industrial and
Infrastructure
Products
 
Renewable Energy & Conservation
 
Total
Balance at December 31, 2015
$
181,285

 
$
53,704

 
$
57,401

 
$
292,390

Foreign currency translation

 
895

 
379

 
1,274

Balance at March 31, 2016
$
181,285

 
$
54,599

 
$
57,780

 
$
293,664


The goodwill balances as of March 31, 2016 and December 31, 2015 are net of accumulated impairment losses of $255,530,000.

Acquired Intangible Assets
Acquired intangible assets consist of the following (in thousands):
 
March 31, 2016
 
December 31, 2015
 
 
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Estimated Life
Indefinite-lived intangible assets:
 
 
 
 
 
 
 
 
 
Trademarks
$
50,658

 
$

 
$
50,538

 
$

 
Indefinite
Finite-lived intangible assets:
 
 
 
 
 
 
 
 
 
Trademarks
5,842

 
1,970

 
5,861

 
1,884

 
5 to 15 Years
Unpatented technology
25,665

 
8,662

 
28,072

 
10,656

 
5 to 20 Years
Customer relationships
79,714

 
30,855

 
85,419

 
35,673

 
5 to 17 Years
Non-compete agreements
1,649

 
392

 
3,107

 
1,771

 
4 to 10 Years
Backlog

 

 
6,480

 
6,480

 
0.5 to 2 Years
 
112,870

 
41,879

 
128,939

 
56,464

 
 
Total acquired intangible assets
$
163,528

 
$
41,879

 
$
179,477

 
$
56,464

 
 


The following table summarizes the acquired intangible asset amortization expense for the three months ended March 31 (in thousands):
 
Three Months Ended 
 March 31,
 
2016
 
2015
Amortization expense
$
2,181

 
$
1,426




Amortization expense related to acquired intangible assets for the remainder of fiscal 2016 and the next five years thereafter is estimated as follows (in thousands):
2016
$6,453
2017
$8,314
2018
$7,759
2019
$7,076
2020
$6,562
2021
$5,960