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Debt Debt (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Line of Credit Facility [Line Items]    
Debt Instrument, Unused Borrowing Capacity, Amount $ 664,200  
Notes payable bank - homebuilding operations 222,700 $ 0
letters of credit outstanding under credit facility 48,800  
Maximum borrowing availability subject to limit 228,500  
Aggregate Capacity of Secured Letters of Credit under Credit Facility 1,000  
Letters of Credit Outstanding Under Letter of Credit Facilities   600
Restricted Cash for Secured Letter of Credit Agreements   $ 600
Second Amendment to Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Sub-limit for letters of credit 125,000  
Line of Credit Facility, Maximum Borrowing Capacity $ 500,000  
Basis Points Spread on Variable Rate - Credit Facility 250  
2025 Senior Notes [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument, Face Amount $ 250,000  
Debt Instrument, Interest Rate, Stated Percentage 5.625%  
2021 Senior Notes [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument, Face Amount $ 300,000  
Debt Instrument, Interest Rate, Stated Percentage 6.75%