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Intangible assets (Notes)
 9 Months Ended
Sep. 30, 2018
Intangible Assets [Abstract]  
Intangible Assets Disclosure [Text Block]
Intangible assets

The gross carrying amount and accumulated amortization by intangible asset class were as follows:
 
(Dollars in thousands)
 
September 30, 2018
 
December 31, 2017
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Value
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Value
Trade names
$
7,994

 
$
(1,341
)
 
$
6,653

 
$
8,182

 
$
(957
)
 
$
7,225

Customer relationships
4,785

 
(537
)
 
4,248

 
4,911

 
(323
)
 
4,588

 
$
12,779

 
$
(1,878
)
 
$
10,901

 
$
13,093

 
$
(1,280
)
 
$
11,813



Amortization expense of $0.7 million and $0.2 million related to intangible assets was recorded in General and administrative expenses for the nine months ended September 30, 2018 and 2017, respectively.