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Derivative Instruments - Cash flow hedges (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Effects of derivative instruments |  |
Unrealized loss on derivative instruments | $ (2,298) | $ (3,331)
Cash flow hedging |  |
Effects of derivative instruments |  |
Unrealized loss on derivative instruments | 2,298 | 3,331
Cash flow hedging | Interest rate contracts | Interest expense |  |
Effects of derivative instruments |  |
Unrealized loss on derivative instruments | $ 2,298 | $ 3,331

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- Definition Amount, before tax and after reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness, attributable to parent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 + Details
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