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Summary of Significant Accounting Policies (Narrative) (Details) shares in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2016 USD ($) | Aug. 31, 2014 USD ($) | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) home lot shares | Mar. 31, 2016 USD ($) home lot
Business Combination, Consideration Transferred |  | $ 82,400,000 |  |  |  |
Number of Units in Real Estate Property | lot |  |  |  |  | 8,200 |
Intangible asset useful life |  |  | 20 years |  |  |
Sales Commissions and Fees |  |  | $ 268,300,000 | $ 204,900,000 | $ 193,600,000 |
Percentage_commisions_of_sales_reclass |  |  | 3.60% | 3.50% | 3.40% |
Unfunded settlements |  |  | $ 66,500,000 | $ 27,500,000 |  |
Restricted Cash and Cash Equivalents |  |  | 24,366,000 | 21,274,000 |  |
Intangible assets, acquired cost (gross) |  |  | 277,000,000 | 259,000,000 |  |
Intangible assets, accumulated amortization |  |  | 162,600,000 | 148,800,000 |  |
Intangible assets amortization expense |  |  | 13,800,000 | 12,900,000 | $ 13,033,000 |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months |  |  | 13,800,000 |  |  |
Future Amortization Expense, Year Two |  |  | 13,800,000 |  |  |
Future Amortization Expense, Year Three |  |  | 13,800,000 |  |  |
Future Amortization Expense, Year Four |  |  | 13,800,000 |  |  |
Future Amortization Expense, Year Five |  |  | 13,800,000 |  |  |
Property and equipment, net |  |  | 77,444,000 | 86,312,000 |  |
Property and equipment, accumulated depreciation |  |  | 192,900,000 | 185,800,000 |  |
Depreciation Expense |  |  | 40,200,000 | 33,300,000 | 26,800,000 |
Advertising Expense |  |  | 50,700,000 | 45,300,000 | 41,800,000 |
Employee benefit plan company contributions |  |  | $ 14,600,000 | $ 12,600,000 | $ 12,100,000 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  |  | 1.8 | 3.9 | 6.6 |
Number of VIEs requiring consolidation |  |  | 0 |  |  |
Residential mortgage loans available-for-sale |  |  | $ 539,496,000 | $ 442,715,000 |  |
Residential mortgage loans available-for-sale aggregate outstanding principal balance |  |  | 529,700,000 | 429,600,000 |  |
Net gain (loss) from change in fair value |  |  | 2,800,000 | (300,000) |  |
Net gains from the sale of mortgages |  |  | 109,600,000 | 80,800,000 | $ 67,200,000 |
Loans held for investment, net |  |  | $ 8,400,000 | 7,600,000 |  |
Days past contractual term once loans no longer accrue interest income |  |  | 90 days |  |  |
Variability in future cash flows of derivative instruments in days |  |  | 90 days |  |  |
unrecognized tax benefits in equity share based payment |  |  | 18600 |  |  |
Intangible asset impairment expense |  |  |  | 0 | 0 |
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 |  |  | $ 8,000,000 | 6,900,000 | $ 7,200,000 |
Interest Rate Lock Commitments [Member] |  |  |  |  |  |
Derivative, notional amount |  |  | 273,900,000 | 208,200,000 |  |
Forward Contracts [Member] |  |  |  |  |  |
Derivative, notional amount |  |  | 610,000,000 | 525,000,000 |  |
Whole Loan Commitments [Member] |  |  |  |  |  |
Derivative, notional amount |  |  | $ 157,600,000 | $ 77,600,000 |  |
JW Homes (Wieland) [Member] | JW Homes (Wieland) [Member] |  |  |  |  |  |
Number of Units in Real Estate Property | lot |  |  |  |  |  | 317
Dominion [Member] | Dominion [Member] |  |  |  |  |  |
Number of Units in Real Estate Property | lot |  |  |  |  | 622 |
JW Homes (Wieland) [Member] |  |  |  |  |  |
Business Combination, Consideration Transferred | $ 430,500,000 |  |  |  |  |
Number of Units in Real Estate Property | lot |  |  |  |  |  | 7,000
Goodwill |  |  |  |  |  | $ 40,400,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  |  |  |  | $ 18,000,000
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
Dominion [Member] | Land Option Contracts [Member] |  |  |  |  |  |
Number of Units in Real Estate Property | lot |  |  |  |  | 900 |
Dominion [Member] | Dominion [Member] |  |  |  |  |  |
Number of Units in Real Estate Property | home |  |  |  |  | 400 |
Restricted stock [Member] |  |  |  |  |  |
Share-based compensation vesting period |  |  | 3 years |  |  |

X
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