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Fair Value Measurements
6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value MeasurementsOur interest rate swaps are measured at fair value using readily observable inputs, which are considered to be Level 2 inputs and are recorded in Other long-term liabilities within the accompanying Unaudited Condensed Consolidated Balance Sheets. Refer to Note K - “Derivative Instruments and Hedging Activity” for a complete discussion of our interest rate swaps.
There were no transfers into or out of Level 1, 2 or 3 assets or liabilities during the six months ended June 30, 2020. 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, 2020
Interest rate swap derivative instruments$(2,314) $—  $(2,314) $—  
At December 31, 2019
Interest rate swap derivative instrument$(179) $—  $(179) $—