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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis The following table sets forth by level, within the fair value hierarchy, estimated fair values on a recurring basis (in thousands):
Asset/(Liability) Measured at Fair Value:Asset/(Liability)Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)
Significant
Other
Observable
Inputs 
(Level 2)
Significant
Unobservable
Inputs 
(Level 3)
At June 30, 2021
Interest rate swap derivative instruments$(503)$— $(503)$— 
At December 31, 2020
Interest rate swap derivative instrument$(1,774)$— $(1,774)$—