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Long-term Debt, Line of Credit and Derivatives - Derivative Financial Instruments (Details)
$ in Millions
9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Jul. 31, 2020
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 $ 0.8 $ 1.2    
Fair market value of interest rate swap liability $ 1.8      
Series of Swaps        
Debt Instrument [Line Items]        
Derivative, notional amount       $ 67.5
Derivative, number of instruments held | contract       5
Sixth Swap        
Debt Instrument [Line Items]        
Derivative, notional amount     $ 27.0