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Goodwill and Intangible Assets
12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Intangible Assets

Goodwill represents the excess of the purchase price and related costs over the fair value of the net tangible and intangible assets of businesses acquired.

The carrying amount of our goodwill by segment is as follows:

 
 
Building
Materials
Distribution
 

Wood
Products
 
Total
 
 
(thousands)
Balance at December 31, 2017 and 2016
 
$
5,593

 
$
49,840

 
$
55,433



At December 31, 2017 and 2016, intangible assets represent the values assigned to trade names and trademarks and customer relationships. The trade names and trademarks have indefinite lives and are not amortized. The weighted-average useful life for customer relationships from the date of purchase is approximately 11 years. Amortization expense is expected to be approximately $0.7 million per year for the next five years.

Intangible assets consisted of the following:
 
 
December 31, 2017
 
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
 
 
(thousands)
Trade names and trademarks
 
$
8,900

 
$

 
$
8,900

Customer relationships
 
7,650

 
(1,484
)
 
6,166

 
 
$
16,550

 
$
(1,484
)
 
$
15,066


 
 
December 31, 2016
 
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
 
 
(thousands)
Trade names and trademarks
 
$
8,900

 
$

 
$
8,900

Customer relationships
 
7,400

 
(753
)
 
6,647

 
 
$
16,300

 
$
(753
)
 
$
15,547