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Investment in Receivable Portfolios, Net - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |  |  |
Face Value Of Receivable Portfolios | $ 2,870,456,000 |  | $ 2,441,909,000 |  | $ 4,670,260,000 | $ 4,099,302,000
Purchases of receivable portfolios | $ 359,580,000 |  | $ 246,415,000 |  | $ 636,342,000 | $ 465,142,000
Face value on purchase cost | 12.50% |  | 10.10% |  | 13.60% | 11.30%
Estimated Future Collections At Acquisition For Receivable Portfolios | $ 704,400,000 |  | $ 505,000,000 |  | $ 1,260,600,000 | $ 924,400,000
Revenue recognized, net | (292,662,000) | $ (281,009,000) | (263,407,000) | $ (249,838,000) | (573,671,000) | (513,245,000)
Allowance reversals on receivable portfolios, net | 17,632,000 | (9,811,000) | 8,829,000 | (2,132,000) | 27,443,000 | 10,961,000
Estimate of Zero Basis Cash Flows |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |  |  |
Revenue recognized, net | (33,964,000) | (31,188,000) | (39,097,000) | (38,733,000) |  |
Allowance reversals on receivable portfolios, net | 2,221,000 | $ (1,729,000) | 1,708,000 | $ (1,519,000) |  |
Zero Basis Portfolios |  |  |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |  |  |
Purchases of receivable portfolios | 0 |  | 0 |  | 0 | 0
Revenue recognized, net | (33,964,000) |  | (39,097,000) |  | (65,152,000) | (77,830,000)
Allowance reversals on receivable portfolios, net | $ 2,221,000 |  | $ 1,708,000 |  | $ 3,950,000 | $ 3,227,000

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- Definition Amount of accretion recognized for the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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