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Fair-Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative [Line Items]
Interest income (expense), net	$ (3,734)	$ (2,242)	$ (11,521)	$ (10,042)
Interest Rate Swap
Derivative [Line Items]
Interest income (expense), net			5,300	3,700
Interest Rate Swap Buyouts
Derivative [Line Items]
Interest income (expense), net			$ 300	$ 900

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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

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