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Goodwill and Related Intangible Assets
6 Months Ended
Jun. 30, 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 six months ended June 30, 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

 
368

 
2,039

 
2,407

Balance at June 30, 2016
$
181,285

 
$
54,072

 
$
59,440

 
$
294,797


The goodwill balances as of June 30, 2016 and December 31, 2015 are net of accumulated impairment losses of $234,490,000.
Acquired Intangible Assets
Acquired intangible assets consist of the following (in thousands):
 
June 30, 2016
 
December 31, 2015
 
 
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Estimated Life
Indefinite-lived intangible assets:
 
 
 
 
 
 
 
 
 
Trademarks
$
50,805

 
$

 
$
50,538

 
$

 
Indefinite
Finite-lived intangible assets:
 
 
 
 
 
 
 
 
 
Trademarks
5,840

 
2,126

 
5,861

 
1,884

 
5 to 15 Years
Unpatented technology
25,661

 
9,126

 
28,072

 
10,656

 
5 to 20 Years
Customer relationships
79,074

 
30,874

 
85,419

 
35,673

 
5 to 17 Years
Non-compete agreements
1,649

 
468

 
3,107

 
1,771

 
4 to 10 Years
Backlog

 

 
6,480

 
6,480

 
0.5 to 2 Years
 
112,224

 
42,594

 
128,939

 
56,464

 
 
Total acquired intangible assets
$
163,029

 
$
42,594

 
$
179,477

 
$
56,464

 
 

The following table summarizes the acquired intangible asset amortization expense for the three and six months ended June 30 (in thousands):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2016
 
2015
 
2016
 
2015
Amortization expense
$
2,201

 
$
2,585

 
$
4,382

 
$
4,011


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
$4,303
2017
$8,347
2018
$7,791
2019
$7,107
2020
$6,594
2021
$5,992