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Derivatives - Fair Value Measurements on Recurring Basis (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
2015 Swaps  
Derivatives, Fair Value [Line Items]  
Hedging Instrument, Liability, Fair Value $ (2,804)
2015 Swaps | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)  
Derivatives, Fair Value [Line Items]  
Hedging Instrument, Liability, Fair Value 0
2015 Swaps | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)  
Derivatives, Fair Value [Line Items]  
Hedging Instrument, Liability, Fair Value (2,804)
2015 Swaps | Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3)  
Derivatives, Fair Value [Line Items]  
Hedging Instrument, Liability, Fair Value 0
2014 Swaps  
Derivatives, Fair Value [Line Items]  
Hedging Instrument, Liability, Fair Value (1,875)
2014 Swaps | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)  
Derivatives, Fair Value [Line Items]  
Hedging Instrument, Liability, Fair Value 0
2014 Swaps | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)  
Derivatives, Fair Value [Line Items]  
Hedging Instrument, Liability, Fair Value (1,875)
2014 Swaps | Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3)  
Derivatives, Fair Value [Line Items]  
Hedging Instrument, Liability, Fair Value $ 0