Derivative Financial Instruments - Summary of Fair Value of Interest Rate Related Derivative Financial Instruments and Their Classification on Our Condensed Consolidated Balance Sheets (Details) - Interest Rate Swaps and Collars - Designated as Hedging Instrument - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Other Current Liabilities
Derivative [Line Items]
Fair value of derivative instruments, liability derivatives	$ 624	$ 2,008
Other Liabilities
Derivative [Line Items]
Fair value of derivative instruments, liability derivatives		$ 610