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Inventory (Summary of Interests in Land Option Agreements) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Variable Interest Entity [Line Items]    
Deposits and Pre-acquisition Costs $ 218,437 $ 207,987
Remaining Purchase Price 2,749,086 2,462,579
Land options with VIEs    
Variable Interest Entity [Line Items]    
Deposits and Pre-acquisition Costs 73,940 78,889
Remaining Purchase Price 1,145,136 977,480
Other land options    
Variable Interest Entity [Line Items]    
Deposits and Pre-acquisition Costs 144,497 129,098
Remaining Purchase Price $ 1,603,950 $ 1,485,099