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Debt (Narrative) (Details) - USD ($)
6 Months Ended
Mar. 14, 2019
Jun. 30, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]      
Amount of line of credit outstanding   $ 32,628,000 $ 21,553,000
Revolving Credit Facility [Member] | Line of Credit [Member] | Bank Of America [Member]      
Line of Credit Facility [Line Items]      
Credit facility, term 5 years    
Line of Credit Facility, Increase (Decrease), Net $ 60,000,000.0    
Maximum borrowing capacity of credit facility 5,000,000.0    
Amount of line of credit outstanding 30,000,000 33,000,000  
Remaining borrowing capacity   $ 27,000,000  
Debt Outstanding, Prepayment 29,000,000    
Stated interest rate (percent)   3.90%  
Commitment fee (percent)   0.15%  
Bridge Loan [Member] | Line of Credit [Member] | Bank Of America [Member]      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity of credit facility $ 5,000,000.0    
Debt Instrument Secured, Equity Interest, Percentage 65.00%    
Minimum [Member] | Senior Notes [Member]      
Line of Credit Facility [Line Items]      
Stated interest rate (percent) 1.50%    
Minimum [Member] | Base Rate [Member] | Senior Notes [Member]      
Line of Credit Facility [Line Items]      
Stated interest rate (percent) 0.50%    
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Senior Notes [Member]      
Line of Credit Facility [Line Items]      
Stated interest rate (percent) 2.25%    
Maximum [Member] | Base Rate [Member] | Senior Notes [Member]      
Line of Credit Facility [Line Items]      
Stated interest rate (percent) 1.25%