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Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 23, 2019 USD ($) lot | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2018 USD ($) | Mar. 31, 2017 USD ($) | Jan. 01, 2017 USD ($)
Operating Lease, Liability |  | $ 70,029 |  |  |  |  |  |  |  | $ 70,029 |  |  |  |  |
Finite-Lived Intangible Assets, Net |  | 84,600 |  |  |  | $ 86,800 |  |  |  | 84,600 | $ 86,800 |  |  |  |
Unfunded settlements |  | 6,200 |  |  |  | 40,900 |  |  |  | 6,200 | 40,900 |  |  |  |
Restricted Cash and Cash Equivalents |  | 33,543 |  |  |  | 23,612 |  |  |  | 33,543 | 23,612 |  |  |  |
Intangible assets, accumulated amortization |  | 204,400 |  |  |  | 190,200 |  |  |  | 204,400 | 190,200 |  |  |  |
Intangible assets amortization expense |  |  |  |  |  |  |  |  |  | 14,200 | 13,800 | $ 13,800 |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months |  | 14,400 |  |  |  |  |  |  |  | 14,400 |  |  |  |  |
Future Amortization Expense, Year Two |  | 11,000 |  |  |  |  |  |  |  | 11,000 |  |  |  |  |
Future Amortization Expense, Year Three |  | 6,300 |  |  |  |  |  |  |  | 6,300 |  |  |  |  |
Future Amortization Expense, Year Four |  | 6,250 |  |  |  |  |  |  |  | 6,250 |  |  |  |  |
Future Amortization Expense, Year Five |  | 6,250 |  |  |  |  |  |  |  | 6,250 |  |  |  |  |
Property and equipment, net |  | 111,713 |  |  |  | 92,935 |  |  |  | 111,713 | 92,935 |  |  |  |
Property and equipment, accumulated depreciation |  | $ 218,900 |  |  |  | 209,300 |  |  |  | 218,900 | 209,300 |  |  |  |
Depreciation Expense |  |  |  |  |  |  |  |  |  | 39,800 | 35,600 | 37,200 |  |  |
Advertising Expense |  |  |  |  |  |  |  |  |  | 53,900 | 51,000 | 45,000 |  |  |
Employee benefit plan company contributions |  |  |  |  |  |  |  |  |  | $ 19,100 | 17,900 | 15,700 |  |  |
Number of VIEs requiring consolidation |  | 0 |  |  |  |  |  |  |  | 0 |  |  |  |  |
Residential mortgage loans available-for-sale |  | $ 508,967 |  |  |  | 461,354 |  |  |  | $ 508,967 | 461,354 |  |  |  |
Residential mortgage loans available-for-sale aggregate outstanding principal balance |  | 494,100 |  |  |  | 444,200 |  |  |  | 494,100 | 444,200 |  |  |  |
Net gain (loss) from change in fair value |  |  |  |  |  |  |  |  |  | (600) | 700 |  |  |  |
Net gains from the sale of mortgages |  |  |  |  |  |  |  |  |  | $ 129,400 | 111,300 | 110,900 |  |  |
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 |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,411 |  | $ 18,238
Income Tax Expense (Benefit) |  | (100,153) | $ (93,042) | $ (79,735) | $ (49,946) | (91,842) | $ (95,153) | $ (85,081) | $ (53,440) | $ (322,876) | (325,517) | (491,607) |  |  |
Contract liabilities |  | 294,400 |  |  |  | 254,600 |  |  |  | 294,400 | 254,600 |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  |  |  |  |  |  |  |  | 10,212,957 | 10,188,331 | 8,577,686 |  |  |
Capitalized contract costs |  | 35,100 |  |  |  | 30,800 |  |  |  | $ 35,100 | 30,800 |  |  |  |
Contract assets |  |  |  |  |  |  |  |  |  |  |  |  | 27,700 |  |
Minimum | Office Furniture and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Minimum | Software and Hardware [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Minimum | Model Park Improvements and Furnishings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |
Maximum | Office Furniture and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |
Maximum | Software and Hardware [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Maximum | Model Park Improvements and Furnishings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income on mortgage loans |  |  |  |  |  |  |  |  |  | $ 9,700 | 11,300 | 9,500 |  |  |
Interest Rate Lock Commitments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  | 255,300 |  |  |  | 285,000 |  |  |  | 255,300 | 285,000 |  |  |  |
Forward Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  | 518,200 |  |  |  | 511,000 |  |  |  | 518,200 | 511,000 |  |  |  |
Whole Loan Commitments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  | $ 200,700 |  |  |  | $ 187,800 |  |  |  | $ 200,700 | $ 187,800 |  |  |  |
American West Homes [Member] [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred | $ 163,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property | lot | 1,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | $ 12,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible asset useful life | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
American West Homes [Member] [Member] | Land Option Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property | lot | 2,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
JW Homes (Wieland) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 40,400 |
Restricted stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation vesting period |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  |  |  |  |  |  |  |  | 22,411 |  | 18,644
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,600
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  |  | $ 7,700 |  |  |
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,400 |  |

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