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Fair Value Measurements Fair Value of Financial Instrument Assumptions (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Fair Value of Financial Instrument Assumptions [Line Items] |  |
Assets Held-for-sale, Not Part of Disposal Group |  | $ 5,600,000
Impairment Charge on Reclassified Assets | $ 0.000 | $ 0
Revolving Credit Facility [Member] |  |
Fair Value of Financial Instrument Assumptions [Line Items] |  |
Basis Point Spread on Variable Rate | 2.50% |
Line of Credit Facility, Maximum Borrowing Capacity | $ 500,000,000 |
Line of Credit Facility, Initiation Date | Jul. 18, 2013 |
Warehousing Agreement - Third Amendment to Second Amended and Restated [Member] |  |
Fair Value of Financial Instrument Assumptions [Line Items] |  |
Basis Point Spread on Variable Rate | 2.00% |
Line of Credit Facility, Maximum Borrowing Capacity | $ 125,000,000 |
Line of Credit Facility, Initiation Date | Jun. 24, 2016 |
Repurchase Agreement -Second Amendment to Second Amended and Restated [Member] |  |
Fair Value of Financial Instrument Assumptions [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 65,000,000 |
Line of Credit Facility, Initiation Date | Oct. 30, 2017 |

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- Definition Amount of assets held-for-sale that are not part of a disposal group. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 15 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=77912953&loc=d3e400-110220 + Details
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- Definition For the asset that is reclassified back to held and used from held-for-sale, the amount of impairment charge that is recognized on the reclassification date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 44 -URI http://asc.fasb.org/extlink&oid=29634951&loc=d3e1756-110224 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2459-110228 + Details
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