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Fair Value of Financial Instruments and Derivative Instruments Derivative Instruments - Asset and Liability Position (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Inputs, Level 2    
Derivative [Line Items]    
Derivative instruments – asset position $ 0 $ 62,000
Derivative instruments – liability position 0 2,000
Fair Value, Inputs, Level 3    
Derivative [Line Items]    
Derivative instruments – asset position 0 0
Derivative instruments – liability position $ 0 $ 0