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Goodwill and Other Intangible Assets
3 Months Ended
Apr. 01, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets

The table below summarizes amortizable definite-lived intangible assets as of April 1, 2017 and December 31, 2016, which are reflected in the "Other Assets" line item in the Corporation's Condensed Consolidated Balance Sheets:

 
 
April 1, 2017
 
December 31, 2016
(In thousands)
 
Gross
 
Accumulated Amortization
 
Net
 
Gross
 
Accumulated Amortization
 
Net
Patents
 
$
18,644

 
$
18,624

 
$
20

 
$
18,645

 
$
18,623

 
$
22

Software
 
155,425

 
27,137

 
128,288

 
149,587

 
25,792

 
123,795

Trademarks and trade names
 
7,564

 
1,566

 
5,998

 
7,564

 
1,401

 
6,163

Customer lists and other
 
115,729

 
65,118

 
50,611

 
117,789

 
65,103

 
52,686

Net definite lived intangible assets
 
$
297,362

 
$
112,445

 
$
184,917

 
$
293,585

 
$
110,919

 
$
182,666



Aggregate amortization expense for the three months ended April 1, 2017 and April 2, 2016 was $3.2 million and $2.4 million, respectively. Based on the current amount of intangible assets subject to amortization, the estimated amortization expense for each of the following five fiscal years is as follows:

(In millions)
 
2017
 
2018
 
2019
 
2020
 
2021
Amortization expense
 
$
17.0

 
$
22.3

 
$
21.2

 
$
20.4

 
$
19.7



As events such as acquisitions, dispositions or impairments occur in the future, these amounts may change.

The Corporation also owns certain trademarks and trade names with a net carrying amount of $37.6 million as of April 1, 2017 and December 31, 2016.  These trademarks and trade names, which are reflected in the "Other Assets" line item in the Corporation's Condensed Consolidated Balance Sheets, are deemed to have indefinite useful lives because they are expected to generate cash flows indefinitely.

The changes in the carrying amount of goodwill since December 31, 2016, by reporting segment, are as follows:

 
(In thousands)
 
Office
Furniture
 
Hearth
Products
 
Total
Balance as of December 31, 2016
 
 
 
 
 
 
Goodwill
 
$
165,643

 
$
183,199

 
$
348,842

Accumulated impairment losses
 
(58,000
)
 
(143
)
 
(58,143
)
Net goodwill balance as of December 31, 2016
 
107,643

 
183,056

 
290,699

Foreign currency translation adjustments
 
(12
)
 

 
(12
)
Balance as of April 1, 2017
 
 

 
 

 
 
Goodwill
 
165,631

 
183,199

 
348,830

Accumulated impairment losses
 
(58,000
)
 
(143
)
 
(58,143
)
Net goodwill balance as of April 1, 2017
 
$
107,631

 
$
183,056

 
$
290,687



The Corporation evaluates its goodwill and indefinite-lived intangible assets for impairment on an annual basis during the fourth quarter, or whenever indicators of impairment exist. The Corporation estimates the fair value of its reporting units using various valuation techniques, with the primary technique being a discounted cash flow method.  This method employs market participant based assumptions.