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Mortgage Loans on Real Estate (Mortgage Loans by Credit Quality Indicator) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Mortgage Loans on Real Estate [Abstract]
Performing	$ 2,898,538	$ 2,670,657
In workout	0	1,436
Collateral dependent	1,920	2,222
Principal outstanding	$ 2,900,458	$ 2,674,315

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- Definition

Mortgage loans on real estate at the reporting date that are not performing and will probably be satisfied by taking ownership of the real estate serving as collateral.

+ References

No definition available.

+ Details

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- Definition

Mortgage loans that are in a workout period at the end of the reporting period. Workouts are payment periods that are not in compliance with original loan agreement, such as interest only periods, no debt service payment periods, or escrowing principal portion of payments to be used for capital improvements.

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No definition available.

+ Details

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- Definition

Mortgage loans that are in compliance with contractual terms at end of period.

+ References

No definition available.

+ Details

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Namespace Prefix:	ael_
Data Type:	xbrli:monetaryItemType
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- Definition

Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(c))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5066-111524

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- References

No definition available.

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