Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Derivative Instruments and Hedging Activities Narrative (Details)

v3.20.4
Long-Term Debt - Derivative Instruments and Hedging Activities Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]        
Cash premiums paid     $ 2,800 $ 1,900
Unamortized premium $ 2,200 $ 3,700    
Incremental interest expense 0 1,200 $ 200  
Net benefit expected to be reclassified $ 0      
Designated as hedging instrument | Interest rate swap        
Derivatives, Fair Value [Line Items]        
Derivative liability, fair value of interest rate swap and cap positions   $ 100