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Goodwill and intangible assets - Company's other intangible assets (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 33,783 | $ 33,783
Accumulated amortization | 9,918 | 7,771
Net | $ 23,865 | 26,012
Patents [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization Period (in years) | 5 years |
Gross Carrying Amount | $ 386 | 386
Accumulated amortization | 386 | 383
Net |  | 3
Covenant not to compete [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,270 | 1,270
Accumulated amortization | 898 | 783
Net | $ 372 | 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 | 8,502 | 6,506
Net | $ 23,058 | 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 | 132 | 99
Net | $ 435 | $ 468

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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