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Intangible Assets
 3 Months Ended
Mar. 31, 2018
Finite-Lived Intangible Assets, Net [Abstract]  
Intangible Assets
Intangible Assets
Intangible assets at the balance sheet dates are comprised of the following:
 
March 31, 2018
(Dollars in thousands, lives in years)
Weighted Average Useful
Life
 
Historical
Cost
 
Accumulated
Amortization
 
Net
Balance
Customer relationships
9.3
 
$
62,401

 
$
(35,735
)
 
$
26,666

Trade names and trademarks
7.4
 
6,786

 
(3,257
)
 
3,529

Other intangibles
6.0
 
572

 
(175
)
 
397

 
 
 
$
69,759

 
$
(39,167
)
 
$
30,592

 
 
 
 
 
 
 
 
  
December 31, 2017
(Dollars in thousands, lives in years)
Weighted Average Useful
Life

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

 
$
(34,061
)
 
$
28,340

Trade names and trademarks
7.4
 
6,786

 
(3,000
)
 
3,786

Non-compete agreements
5.0
 
574

 
(574
)
 
—

Other intangibles
6.0
 
572

 
(156
)
 
416

 
 
 
$
70,333

 
$
(37,791
)
 
$
32,542



For the three months ended March 31, 2018 and 2017, intangible assets amortization expense was $2.0 million and $1.9 million, respectively.