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Debt (Narrative) (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 05, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 28, 2018 | May 04, 2018 | May 03, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, outstanding amount |  | $ 236,000,000 |  | $ 236,000,000 |  |  |  |  |
Mortgage repurchase facilities |  | 57,327,000 |  | 57,327,000 |  |  |  |  | $ 48,319,000
Revolving Credit Facility [Member] | Amended And Restated Credit Agreement [Member] | Texas Capital Bank [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maturity date | Apr. 30, 2022 |  |  |  |  |  |  |  |
Line of credit facility. maximum borrowing capacity | $ 540,000,000 | 354,000,000 |  | 354,000,000 |  |  |  |  |
Line of credit facility, outstanding amount |  | 236,000,000 |  | 236,000,000 |  |  |  |  |
Revolving Credit Facility [Member] | Amended And Restated Credit Agreement [Member] | Maximum [Member] | Texas Capital Bank [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Uncommitted option to increase credit facility | $ 100,000,000 |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Amended And Restated Credit Agreement [Member] | Eurodollar Rate [Member] | Maximum [Member] | Texas Capital Bank [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 3.10% |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Amended And Restated Credit Agreement [Member] | Eurodollar Rate [Member] | Minimum [Member] | Texas Capital Bank [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.60% |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Amended And Restated Credit Agreement [Member] | Base Rate [Member] | Maximum [Member] | Texas Capital Bank [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.10% |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Amended And Restated Credit Agreement [Member] | Base Rate [Member] | Minimum [Member] | Texas Capital Bank [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.60% |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Joinder Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  |  | $ 590,000,000 |  |  |
Accordion feature, exercising |  |  |  |  |  | 50,000,000 |  |  |
Accordion feature |  |  |  |  |  | $ 100,000,000 |  |  |
Revolving Mortgage Loan Repurchase Facility [Member] | Master Repurchase Agreement [Member] | Comerica Bank [Member] | Financial Services [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Incurred interest expense |  | 400,000 | $ 100,000 | 800,000 | $ 100,000 |  |  |  |
Revolving Mortgage Loan Repurchase Facility [Member] | Second Master Repurchase Agreement [Member] | Maximum [Member] | Inspire [Member] | Comerica Bank [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 35,000,000 |
Revolving Mortgage Loan Repurchase Facility [Member] | Third Master Repurchase Agreement [Member] | Maximum [Member] | Inspire [Member] | Comerica Bank [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 40,000,000 |  |
Revolving Mortgage Loan Repurchase Facility [Member] | Second Master Repurchase Agreement And Third Master Repurchase Agreement [Member] | Inspire [Member] | Comerica Bank [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage repurchase facilities |  | $ 57,300,000 |  | $ 57,300,000 |  |  |  |  |
Revolving Mortgage Loan Repurchase Facility [Member] | Second Master Repurchase Agreement And Third Master Repurchase Agreement [Member] | Maximum [Member] | Inspire [Member] | Comerica Bank [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 75,000,000 |  |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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