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Fair-Value Measurements (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Derivative [Line Items] |  |  |  |
Interest income (expense), net | $ (4,218) | $ (3,823) | $ (7,787) | $ (7,800)
Interest Rate Swap |  |  |  |
Derivative [Line Items] |  |  |  |
Interest income (expense), net |  |  | 3,500 | 1,900
Interest Rate Swap Buyouts |  |  |  |
Derivative [Line Items] |  |  |  |
Interest income (expense), net |  |  | $ 300 | $ 400

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- Definition The net amount of operating interest income (expense). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.10) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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