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Long-term debt - Schedule of Long-term Debt Consisting of Advances (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Debt Instrument |  |
Long-term debt | $ 49,734 | $ 58,134
February 2017 |  |
Debt Instrument |  |
Fixed interest rate (as a percent) | 4.99% |
Long-term debt |  | 77
September 2017 |  |
Debt Instrument |  |
Fixed interest rate (as a percent) | 2.36% |
Long-term debt |  | 6,500
April 2018 |  |
Debt Instrument |  |
Fixed interest rate (as a percent) | 3.83% |
Long-term debt | $ 40 | 156
December 2018 |  |
Debt Instrument |  |
Fixed interest rate (as a percent) | 1.27% |
Long-term debt | $ 10,000 | 10,000
December 2019 |  |
Debt Instrument |  |
Adjustable interest rate (as a percent) | 3.04% |
Long-term debt | $ 3,000 | 3,000
December 2019 |  |
Debt Instrument |  |
Adjustable interest rate (as a percent) | 2.82% |
Long-term debt | $ 6,300 | 6,300
December 2019 |  |
Debt Instrument |  |
Fixed interest rate (as a percent) | 1.62% |
Long-term debt | $ 10,000 | 10,000
June 2020 |  |
Debt Instrument |  |
Fixed interest rate (as a percent) | 1.74% |
Long-term debt | $ 5,000 | 5,000
December 2020 |  |
Debt Instrument |  |
Fixed interest rate (as a percent) | 1.84% |
Long-term debt | $ 5,000 | 5,000
March 2023 |  |
Debt Instrument |  |
Fixed interest rate (as a percent) | 4.69% |
Long-term debt | $ 10,394 | $ 12,101

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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