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Debt - Interest Rate Swap Contracts as Reflected on Balance Sheet (Details) - Designated as Hedging Instrument - Interest Rate Swaps - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Total derivatives | $ 7,467 | $ 11,309
Current assets: Other Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Assets derivatives | 2,853 | 3,867
Long-term assets: Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Assets derivatives | 4,614 | 7,442
Current Liabilities: Other Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | 0 | 0
Long-Term Liabilities: Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | $ 0 | $ 0

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