Derivatives - Fair Value Measurements on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
2015 Swaps
Derivatives, Fair Value [Line Items]
Hedging Instrument, Liability, Fair Value	$ (5,167)	$ (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	(5,167)	(7,317)
2015 Swaps | Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3)
Derivatives, Fair Value [Line Items]
Hedging Instrument, Liability, Fair Value	0	0
2021 Swaps
Derivatives, Fair Value [Line Items]
Hedging Instrument, Liability, Fair Value	(1,885)	(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, Liability, Fair Value	0	0
2021 Swaps | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Derivatives, Fair Value [Line Items]
Hedging Instrument, Liability, Fair Value	(1,885)	(6,244)
2021 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