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General and Administrative Expenses and Other Expenses - Components of Operating Expenses (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 15, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fixed compensation expense |  |  |  |  |  |  |  |  |  | $ 39,747 | $ 24,445 | $ 22,111
Variable compensation expense |  |  |  |  |  |  |  |  |  | 25,069 | 14,589 | 20,574
Equity compensation expense |  |  |  |  |  |  |  |  |  | 13,402 | 12,388 | 10,141
Acquisition-related equity compensation expense |  |  |  |  |  |  |  |  |  | 1,010 | 0 | 0
Systems and consulting |  |  |  |  |  |  |  |  |  | 10,746 | 7,451 | 7,073
Loan acquisition costs |  |  |  |  |  |  |  |  |  | 7,031 | 7,697 | 5,022
Office costs |  |  |  |  |  |  |  |  |  | 6,310 | 4,705 | 4,248
Accounting and legal |  |  |  |  |  |  |  |  |  | 5,450 | 5,529 | 2,842
Corporate costs |  |  |  |  |  |  |  |  |  | 2,351 | 1,955 | 1,856
Other |  |  |  |  |  |  |  |  |  | 7,556 | 4,023 | 3,289
Total General and Administrative Expenses |  |  |  |  |  |  |  |  |  | 118,672 | 82,782 | 77,156
Amortization of purchase-related intangible assets |  |  |  |  |  |  |  |  |  | 8,699 | 177 | 0
Contingent consideration expense |  |  |  |  |  |  |  |  |  | 3,217 | 0 | 0
Other |  |  |  |  |  |  |  |  |  | 1,106 | 19 | 0
Total Other Expenses |  |  |  |  |  |  |  |  |  | 13,022 | 196 | 0
Total General and Administrative Expenses and Other Expenses |  | $ 49,444 | $ 29,346 | $ 28,707 | $ 24,197 | $ 19,378 | $ 21,561 | $ 19,009 | $ 23,030 | $ 131,694 | $ 82,978 | 77,156
Upfront costs associated with hiring new executive officer |  |  |  |  |  |  |  |  |  |  |  | $ 2,000
CoreVest LLC |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition-related equity compensation expense | $ 10,000 |  |  |  |  |  |  |  |  |  |  |
Restricted stock awards (in shares) | 588,260 |  |  |  |  |  |  |  |  |  |  |
Restricted stock awards | $ 10,000 |  |  |  |  |  |  |  |  |  |  |
Contingent consideration performance term | 2 years |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of expense for salary and wage arising from service rendered by officer. Excludes allocated cost, labor-related nonsalary expense, and direct and overhead labor cost included in cost of good and service sold. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(4)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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