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Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands, shares in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Mar. 31, 2017 USD ($) home lot
Income statement impact ASU 2016-09 adoption |  | 7700 |  |  |
Intangible asset useful life |  | 20 years |  |  |
Unfunded settlements |  | $ 80,300 | $ 66,500 |  |
Restricted Cash and Cash Equivalents |  | 33,485 | 24,366 |  |
Intangible assets, acquired cost (gross) |  | 277,000 | 277,000 |  |
Intangible assets, accumulated amortization |  | 176,400 | 162,600 |  |
Intangible assets amortization expense |  | 13,800 | 13,800 | $ 12,900 |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months |  | 13,800 |  |  |
Future Amortization Expense, Year Two |  | 13,800 |  |  |
Future Amortization Expense, Year Three |  | 13,800 |  |  |
Future Amortization Expense, Year Four |  | 10,404 |  |  |
Future Amortization Expense, Year Five |  | 5,650 |  |  |
Property and equipment, net |  | 70,706 | 77,444 |  |
Property and equipment, accumulated depreciation |  | 206,500 | 192,900 |  |
Depreciation Expense |  | 37,200 | 40,200 | 33,300 |
Advertising Expense |  | 45,000 | 50,700 | 45,300 |
Employee benefit plan company contributions |  | $ 15,700 | $ 14,600 | $ 12,600 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  | 0.1 | 1.8 | 3.9 |
Number of VIEs requiring consolidation |  | 0 |  |  |
Residential mortgage loans available-for-sale |  | $ 570,600 | $ 539,496 |  |
Residential mortgage loans available-for-sale aggregate outstanding principal balance |  | 553,500 | 529,700 |  |
Net gain (loss) from change in fair value |  | (2,200) | 2,800 |  |
Net gains from the sale of mortgages |  | 110,900 | 109,600 | $ 80,800 |
Loans held for investment, net |  | $ 11,200 | 8,400 |  |
Days past contractual term once loans no longer accrue interest income |  | 90 days |  |  |
Variability in future cash flows of derivative instruments in days |  | 60 days |  |  |
Furniture and Fixtures [Member] |  |  |  |  |
Property and equipment, useful life |  | 2 years |  |  |
Minimum [Member] |  |  |  |  |
Period of Reimbursement of Payments on Loan Prepay in Days |  | 90 days |  |  |
Minimum [Member] | Equipment [Member] |  |  |  |  |
Property and equipment, useful life |  | 3 years |  |  |
Maximum [Member] |  |  |  |  |
Period of Reimbursement of Payments on Loan Prepay in Days |  | 120 days |  |  |
Maximum [Member] | Equipment [Member] |  |  |  |  |
Property and equipment, useful life |  | 10 years |  |  |
Financial Services [Member] |  |  |  |  |
Interest income on mortgage loans |  | $ 9,500 | 8,000 | $ 6,900 |
Interest Rate Lock Commitments [Member] |  |  |  |  |
Derivative, notional amount |  | 210,900 | 273,900 |  |
Forward Contracts [Member] |  |  |  |  |
Derivative, notional amount |  | 522,000 | 610,000 |  |
Whole Loan Commitments [Member] |  |  |  |  |
Derivative, notional amount |  | $ 203,100 | 157,600 |  |
JW Homes (Wieland) [Member] | JW Homes (Wieland) [Member] |  |  |  |  |
Number of Units in Real Estate Property | lot |  |  |  |  | 317
JW Homes (Wieland) [Member] |  |  |  |  |
Business Combination, Consideration Transferred | $ 430,500 |  |  |  |
Number of Units in Real Estate Property | lot |  |  |  |  | 7,000
Goodwill |  |  |  |  | $ 40,400
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  |  |  | $ 18,000
JW Homes (Wieland) [Member] | JW Homes (Wieland) [Member] |  |  |  |  |
Number of Units in Real Estate Property | home |  |  |  |  | 375
JW Homes (Wieland) [Member] | Land Option Contracts [Member] |  |  |  |  |
Number of Units in Real Estate Property | lot |  |  |  |  | 1,300
Restricted stock [Member] |  |  |  |  |
Share-based compensation vesting period |  | 3 years |  |  |
Accounting Standards Update 2016-09, Excess Tax Benefit Component [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member] | Retained Earnings [Member] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ 18,600 |  |

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