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Loans Payable, Senior Notes, and Mortgage Company Loan Facility Mortgage Company Loan Facility (Details Textual 4) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2019
Oct. 31, 2019
Oct. 31, 2018
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 1,628,150  
Mortgage company loan facility   150,000 $ 150,000
Mortgage Loans on Real Estate, Commercial and Consumer, Net   218,777 170,731
Warehouse Agreement Borrowings [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Current Borrowing Capacity   75,000  
Line of Credit Facility, Maximum Borrowing Capacity   $ 150,000  
Debt Instrument, Maturity Date   Dec. 06, 2019  
Debt Instrument, Interest Rate, Effective Percentage   3.68%  
Mortgage company loan facility   $ 150,000 150,000
Mortgage Loans on Real Estate, Commercial and Consumer, Net   208,600 $ 163,200
Aggregate Outstanding Purchase Price Limitations   $ 0  
London Interbank Offered Rate (LIBOR) [Member] | Warehouse Agreement Borrowings [Member]      
Line of Credit Facility [Line Items]      
Interest Rate on Loan Commitments in Addition to Libor   1.90%  
Minimum [Member]      
Line of Credit Facility [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   1.26% 1.15%
Subsequent Event [Member] | Warehouse Agreement Borrowings [Member]      
Line of Credit Facility [Line Items]      
Debt Instrument, Maturity Date Dec. 04, 2020