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Credit Facility (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Line of Credit Facility [Line Items]        
Interest Expense $ 57 $ 27 $ 171 $ 27
Bank of America N.A. [Member] | Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Current Borrowing Capacity $ 150,000   $ 150,000  
Debt, Weighted Average Interest Rate 3.51%   3.51%  
Funded Debt To EBITDA Ratio     2.0  
London Interbank Offered Rate (LIBOR) [Member] | Bank of America N.A. [Member] | Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 1.25%      
Funded Debt To EBITDA Ratio [Member] | Bank of America N.A. [Member] | Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 1.75%