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Goodwill and intangible assets - Company's other intangible assets (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 33,783 | $ 33,783
Accumulated amortization | 9,203 | 7,771
Net | $ 24,580 | 26,012
Patents [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization Period (in years) | 5 years |
Gross Carrying Amount | $ 386 | 386
Accumulated amortization | 385 | 383
Net | 1 | 3
Covenant not to compete [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,270 | 1,270
Accumulated amortization | 860 | 783
Net | $ 410 | 487
Covenant not to compete [Member] | Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization Period (in years) | 10 years |
Covenant not to compete [Member] | Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization Period (in years) | 6 years |
Customer relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 31,560 | 31,560
Accumulated amortization | 7,837 | 6,506
Net | $ 23,723 | 25,054
Customer relationships [Member] | Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization Period (in years) | 12 years |
Customer relationships [Member] | Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization Period (in years) | 10 years |
Above market leases [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization Period (in years) | 13 years |
Gross Carrying Amount | $ 567 | 567
Accumulated amortization | 121 | 99
Net | $ 446 | $ 468

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