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Inventory (Summary of Interests in Land Option Agreements) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Variable Interest Entity [Line Items]    
Deposits and Pre-acquisition Costs $ 301,404 $ 299,437
Remaining Purchase Price 3,532,626 3,221,962
Land options with VIEs    
Variable Interest Entity [Line Items]    
Deposits and Pre-acquisition Costs 118,138 123,775
Remaining Purchase Price 1,451,952 1,466,585
Other land options    
Variable Interest Entity [Line Items]    
Deposits and Pre-acquisition Costs 183,266 175,662
Remaining Purchase Price $ 2,080,674 $ 1,755,377