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Fair-Value Measurements (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative [Line Items] |  |  |  |
Interest expense |  | $ 20,242 | $ 18,602 | $ 15,541
Interest Rate Swap [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Interest expense |  | 500 | 800 | $ 1,900
Interest Rate Swap Buyouts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Interest expense |  |  | $ 700 |
Interest income |  | $ 600 |  |
Interest Rate Swap Buyouts [Member] | Subsequent Event [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Interest expense | $ 500 |  |  |

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