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Debt Debt (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Line of Credit Facility [Line Items]      
Maximum borrowing availability, subject to obtaining additional commitments $ 500,000    
Debt Instrument, Unused Borrowing Capacity, Amount 512,100    
Notes payable bank - homebuilding operations 0   $ 40,300
letters of credit outstanding under credit facility 40,800    
Maximum borrowing availability subject to limit 434,200    
Aggregate Capacity of Secured Letters of Credit under Credit Facility 1,000 $ 2,000  
Letters of Credit Outstanding Under Letter of Credit Facilities 610   624
Restricted Cash for Secured Letter of Credit Agreements 616   $ 630
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 $ 475,000    
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%    
2018 Convertible Senior Notes [Member]      
Line of Credit Facility [Line Items]      
Convertible Subordinated Debt $ 86,250    
Debt Instrument, Interest Rate, Stated Percentage 3.00%