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Debt (Schedule of Lines of Credit Outstanding) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]    
Long-term Line of Credit $ 206,522 $ 200,386
Debt issuance costs, net of amortization (1,478) (1,614)
Inwood National Bank    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 75,000  
Unsecured Revolving Credit Facility [Member] | Unsecured Debt [Member] | Citibank, N.A., Credit Suisse AG, Cayman Islands Branch, Flagstar Bank, JP Morgan Chase and Chemical Bank [Member]    
Line of Credit Facility [Line Items]    
Long-term Line of Credit 215,000  
Line of Credit Facility, Maximum Borrowing Capacity 275,000  
Revolving Credit Facility [Member] | Inwood National Bank    
Line of Credit Facility [Line Items]    
Long-term Line of Credit 52,500 46,500
Unsecured Debt [Member] | Citibank, N.A., Credit Suisse AG, Cayman Islands Branch, Flagstar Bank, JP Morgan Chase and Chemical Bank [Member]    
Line of Credit Facility [Line Items]    
Long-term Line of Credit $ 155,500 $ 155,500