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Fair-Value Measurements (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative [Line Items] |  |  |
Interest expense | $ 18,602 | $ 15,541 | $ 11,841
Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Interest expense | 800 | 1,900 | $ 1,900
Interest Rate Swap Buyouts [Member] |  |  |
Derivative [Line Items] |  |  |
Interest expense | 700 | $ 600 |
Interest Rate Swap Buyouts [Member] | Scenario, Forecast [Member] |  |  |
Derivative [Line Items] |  |  |
Interest income | $ 600 |  |

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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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