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Long-term Debt, Line of Credit and Derivatives - Derivative Financial Instruments (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 06, 2018
USD ($)
Mar. 31, 2018
USD ($)
Sep. 16, 2015
USD ($)
contract
Debt Instrument [Line Items]          
Percent of aggregate principal amount hedged     50.00%   50.00%
Interest rate swap liability $ 336 $ 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       $ 300  
Liability          
Debt Instrument [Line Items]          
Derivatives (400)        
Liability | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring          
Debt Instrument [Line Items]          
Derivatives $ 442 $ 79