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Intangible Assets
 9 Months Ended
Sep. 30, 2017
Finite-Lived Intangible Assets, Net [Abstract]  
Intangible Assets
Intangible Assets
Intangible assets at the balance sheet dates are comprised of the following:
 
September 30, 2017
(Dollars in thousands, lives in years)
Weighted Average Useful
Life
 
Historical
Cost
 
Accumulated
Amortization
 
Net
Balance
Customer relationships
9.3
 
$
62,401

 
$
(32,387
)
 
$
30,014

Trade names and trademarks
7.4
 
6,786

 
(2,743
)
 
4,043

Non-compete agreements
5.0
 
574

 
(558
)
 
16

Other intangibles
6.0
 
572

 
(117
)
 
455

 
 
 
$
70,333

 
$
(35,805
)
 
$
34,528

 
 
 
 
 
 
 
 
  
December 31, 2016
(Dollars in thousands, lives in years)
Weighted Average Useful
Life

 
Historical
Cost
 
Accumulated
Amortization
 
Net
Balance
Customer relationships
9.3
 
$
62,401

 
$
(27,364
)
 
$
35,037

Trade names and trademarks
7.4
 
6,786

 
(1,972
)
 
4,814

Non-compete agreements
5.0
 
574

 
(512
)
 
62

Other intangibles
6.0
 
572

 
—

 
572

 
 
 
$
70,333

 
$
(29,848
)
 
$
40,485



For the three months ended September 30, 2017 and 2016, intangible assets amortization expense was $2.0 million and $1.1 million, respectively. For the nine months ended September 30, 2017 and 2016, intangible assets amortization expense was $6.0 million and $3.2 million, respectively. The increase in the 2017 periods was due to the additional amortization expense attributable to intangible assets associated with the acquisition of Manchester Industries in December 2016.