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Significant Accounting Policies and Consolidated Financial Statement Components Fees and Related Income on Earning Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Fees on credit products	$ 10,427	$ 3,526
Changes in fair value of loans and fees receivable recorded at fair value	3,456	1,587
Changes in fair value of notes payable associated with structured financings recorded at fair value	2,315	3,773
Rental revenue	148	8,235
Nonoperating Income (Expense)	(2,057)	195
Total fees and related income on earning assets	$ 14,289	$ 17,316

X

- Definition

This element represents [net] revaluations of notes payable liability measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

+ References

No definition available.

+ Details

Name:	atlc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityRevaluationsOfNotesPayable
Namespace Prefix:	atlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Fees and related income on earning assets primarily include: (1) lending fees; (2) fees associated with our credit card receivables; (3) changes in the fair value of loans and fees receivable; (4) changes in fair value of notes payable associated with structured financings; (5) income on investments in previously charged-off receivables; (6) gross profits and losses from auto sales; (7) gains associated with investments in securities; and (8) gains realized associated with our settlement of litigation.

+ References

No definition available.

+ Details

Name:	atlc_FeesAndRelatedIncomeOnEarningAssets
Namespace Prefix:	atlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Refers to the increase (decrease) during the reporting period in fair value of loans and fees receivable recorded at fair value.

+ References

No definition available.

+ Details

Name:	atlc_IncreaseDecreaseInFairValueOfLoansAndFeesReceivableRecordedAtFairValue
Namespace Prefix:	atlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Leased Merchandise Revenue and associated fees

+ References

No definition available.

+ Details

Name:	atlc_LeasedMerchandiseRevenue
Namespace Prefix:	atlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Income earned from credit card services including late, over limit, and annual fees. This item excludes interest income earned on credit card balances and transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13 (d))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

Name:	us-gaap_FeesAndCommissionsCreditCards
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_NonoperatingIncomeExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration