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Debt (Narrative) (Details) - USD ($)
Aug. 01, 2019
Jun. 30, 2019
Dec. 31, 2018
Dec. 15, 2015
Jul. 30, 2015
Debt Instrument [Line Items]          
Costs associated with amendment   $ 1,343,000 $ 1,614,000    
Borrowings on lines of credit   232,657,000 200,386,000    
Unsecured Debt [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity   275,000,000.0      
Borrowings on lines of credit   $ 215,000,000.0   $ 40,000,000.0  
Unsecured Debt [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Interest Rate at Period End   4.88%      
Unsecured Debt [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Interest Rate at Period End   4.92%      
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity   $ 75,000,000.0     $ 50,000,000.0
Borrowings on lines of credit   $ 55,500,000 $ 46,500,000    
Line of Credit Facility, Interest Rate at Period End   5.25%      
Revolving Credit Facility [Member] | Subsequent Event [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Interest Rate at Period End 5.00%