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Fair-Value Measurements (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Derivative [Line Items] |  |
Interest expense (income) | $ (4,417) | $ (4,288)
Interest Rate Current Swap [Member] |  |
Derivative [Line Items] |  |
Interest expense (income) | (300) | 500
Interest Rate Swap Buyouts [Member] |  |
Derivative [Line Items] |  |
Interest expense (income) | $ 100 | $ 200

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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=116637391&loc=SL114874048-224260 + Details
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