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Fair-Value Measurements (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Derivative [Line Items] |  |  |  |
Interest expense (income) | $ (4,621) | $ (4,429) | $ (13,530) | $ (13,042)
Interest Rate Current Swap [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Interest expense (income) |  |  | 600 | 600
Interest Rate Swap Buyouts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Interest expense (income) |  |  | $ (500) | $ 600

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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=114873765&loc=SL114874048-224260 + Details
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