Quarterly report pursuant to Section 13 or 15(d)

Debt - Interest Rate Swap Contracts as Reflected on Balance Sheet (Details)

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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