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Summary of Significant Accounting Policies (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Assumption Duration [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, Deferred asset re-measurement as a result of Tax Act | $ 6,520 | $ 0 | $ 0
Servicing Asset | $ 7,821 | 11,443 |
Number of Operating Segments | 15 |  |
Restricted Cash and Cash Equivalents | $ 986 | 1,088 |
Investment in joint venture arrangements | 20,525 | 28,016 |
Outstanding Deposits On Land and Lots | 50,449 |  |
Land purchase deposits | 32,556 | 29,856 |
Outstanding Letters of Credit in Lieu of Cash Deposits under Certain Land Option Contracts | 7,249 |  |
Short-term Non-bank Loans and Notes Payable | 5,000 |  |
Consolidated inventory not owned | 21,545 | 7,528 |
Obligation for consolidated inventory not owned | $ 21,545 | $ 7,528 |
Number of loans we retain mortgage servicing rights on | 3,094 | 4,445 |
Letters of Credit and Bonds | $ 179,563 |  |
Outstanding Performance Bonds | 122,294 |  |
Performance letters of credit outstanding | 41,550 |  |
Financial Letters of Credit | 8,103 |  |
Financial Bonds | $ 7,616 |  |
Minimum [Member] |  |  |
Assumption Duration [Line Items] |  |  |
Discount Rate Used in Determining Fair Value of land/lots | 13.00% | 13.00% |
Equity Method Investment, Ownership Percentage | 25.00% | 25.00% |
Maximum [Member] |  |  |
Assumption Duration [Line Items] |  |  |
Discount Rate Used in Determining Fair Value of land/lots | 16.00% | 16.00% |
Equity Method Investment, Ownership Percentage | 97.00% | 74.00% |

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