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Long-term Debt, Line of Credit and Derivatives - Derivative Financial Instruments (Details)
$ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 06, 2018
USD ($)
Sep. 16, 2015
USD ($)
contract
Debt Instrument [Line Items]        
Percent Of aggregate principal amount hedged       50.00%
Change in fair market value of interest rate swaps $ 0.9 $ 1.0    
Fair market value of interest rate swap liability $ 2.0      
Swap        
Debt Instrument [Line Items]        
Derivative, notional amount     $ 27.0 $ 67.5
Derivative, number of instruments held | contract       5