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Investment in Joint Venture Arrangements Investment in Joint Venture Arrangements Balance Sheet Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]      
Investment in joint venture arrangements $ 37,885 $ 35,870  
Investment in and advances to joint venture arrangements 30,188 31,867 $ 12,088
Distribution of single-family lots from unconsolidated LLC's 27,672 16,158 $ 16,600
Company's investment in joint development or similar agreements $ 35,500 $ 33,300