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Intangible assets (Notes)
 3 Months Ended
Mar. 31, 2019
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)
 
March 31, 2019
 
December 31, 2018
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Value
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Value
Trade names
$
8,234

 
$
(1,592
)
 
$
6,642

 
$
8,090

 
$
(1,447
)
 
$
6,643

Customer relationships
7,211

 
(837
)
 
6,374

 
7,114

 
(645
)
 
6,469

 
$
15,445

 
$
(2,429
)
 
$
13,016

 
$
15,204

 
$
(2,092
)
 
$
13,112



Amortization expense of $0.3 million and $0.2 million related to intangible assets was recorded in General and administrative expenses for the three months ended March 31, 2019 and 2018, respectively.