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Long-term Debt, Line of Credit and Derivatives - Derivative Financial Instruments (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 06, 2018
USD ($)
Sep. 16, 2015
USD ($)
contract
Debt Instrument [Line Items]        
Interest rate liability $ 1,270 $ 52    
Interest Rate Swap        
Debt Instrument [Line Items]        
Percent of aggregate principal amount hedged     50.00% 50.00%
Derivative, notional amount     $ 27,000 $ 67,500
Derivative, number of sequential instruments held | contract       5
Interest rate liability 1,200      
Fair value of interest rates $ (1,300)