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Derivatives - Fair Value Measurements on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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2021 Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Asset, Fair Value | $ 78 |
Hedging Instrument, Liability, Fair Value | (1,395) | $ (6,244)
2021 Swaps | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Asset, Fair Value | 0 |
Hedging Instrument, Liability, Fair Value | 0 | 0
2021 Swaps | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Asset, Fair Value | 78 |
Hedging Instrument, Liability, Fair Value | (1,395) | (6,244)
2021 Swaps | Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3) |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Asset, Fair Value | 0 |
Hedging Instrument, Liability, Fair Value | 0 | 0
2015 Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Liability, Fair Value | (4,152) | (7,317)
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 | 0
2015 Swaps | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Liability, Fair Value | (4,152) | (7,317)
2015 Swaps | Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3) |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Liability, Fair Value | $ 0 | 0
2014 Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Liability, Fair Value |  | (333)
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 |  | (333)
2014 Swaps | Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3) |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Instrument, Liability, Fair Value |  | 0
2020 Swap |  |
Derivatives, Fair Value [Line Items] |  |
Other Derivatives Not Designated as Hedging Instruments Liabilities at Fair Value |  | (106)
2020 Swap | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Derivatives, Fair Value [Line Items] |  |
Other Derivatives Not Designated as Hedging Instruments Liabilities at Fair Value |  | 0
2020 Swap | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Derivatives, Fair Value [Line Items] |  |
Other Derivatives Not Designated as Hedging Instruments Liabilities at Fair Value |  | (106)
2020 Swap | Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3) |  |
Derivatives, Fair Value [Line Items] |  |
Other Derivatives Not Designated as Hedging Instruments Liabilities at Fair Value |  | $ 0

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