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Intangible assets (Tables)
12 Months Ended
Dec. 31, 2017
Intangible Assets [Abstract]  
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
The estimated aggregate amortization expense for each of the next five years are as follows:
 
 
(Dollars in thousands)
Year
 
Amortization
2019
 
$
1,352

2020
 
1,492

2021
 
1,600

2022
 
1,406

2023
 
1,292

Thereafter
 
5,970

 
 
$
13,112



Intangible Assets Disclosure [Text Block]
Intangible assets

The gross carrying amount and accumulated amortization by intangible asset class were as follows:
 
(Dollars in thousands)
 
(Dollars in thousands)
 
December 31, 2018
 
December 31, 2017
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Value
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Value
Trade names
$
8,090

 
$
(1,447
)
 
$
6,643

 
$
8,182

 
$
(957
)
 
$
7,225

Customer relationships
7,114

 
(645
)
 
6,469

 
4,911

 
(323
)
 
4,588

 
$
15,204

 
$
(2,092
)
 
$
13,112

 
$
13,093

 
$
(1,280
)
 
$
11,813


The Company reviews goodwill and intangibles for potential impairment annually on December 1st or when an event or other circumstances change that would more likely than not reduce the fair value of the asset below its carrying value. Amortization expense of $0.9 million and $0.4 million related to intangible assets was recorded in General and administrative expenses for 2018 and 2017, respectively. The estimated aggregate amortization expense for each of the next five years are as follows:
 
 
(Dollars in thousands)
Year
 
Amortization
2019
 
$
1,352

2020
 
1,492

2021
 
1,600

2022
 
1,406

2023
 
1,292

Thereafter
 
5,970

 
 
$
13,112

The gross carrying amount and accumulated amortization by intangible asset class were as follows:
 
(Dollars in thousands)
 
(Dollars in thousands)
 
December 31, 2018
 
December 31, 2017
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Value
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Value
Trade names
$
8,090

 
$
(1,447
)
 
$
6,643

 
$
8,182

 
$
(957
)
 
$
7,225

Customer relationships
7,114

 
(645
)
 
6,469

 
4,911

 
(323
)
 
4,588

 
$
15,204

 
$
(2,092
)
 
$
13,112

 
$
13,093

 
$
(1,280
)
 
$
11,813