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Long-term Debt, Line of Credit and Derivatives - Derivative Financial Instruments (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 06, 2018
USD ($)
Sep. 16, 2015
USD ($)
contract
Debt Instrument [Line Items]        
Percent of aggregate principal amount hedged     50.00% 50.00%
Interest rate swap liability $ 1,094 $ 52    
Swap        
Debt Instrument [Line Items]        
Derivative, notional amount     $ 27,000 $ 67,500
Derivative, number of instruments held (contract) | contract       5
Assets        
Debt Instrument [Line Items]        
Interest rate swap liability 1,100      
Liability        
Debt Instrument [Line Items]        
Derivatives (1,100)      
Liability | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring        
Debt Instrument [Line Items]        
Derivatives $ 1,094 $ 79