Goodwill - (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Beginning Balance	$ 381,273	$ 401,283
Foreign currency translation adjustments	(7,870)	(20,010)
Ending Balance	$ 373,403	$ 381,273	$ 401,283
Maturity of corporate debt with similar credit risk	20 years
US treasury bond maturity	20 years
Discounted cash flow, discount rate	11.88%	12.41%	9.07%
Institutional Products Group
Goodwill [Roll Forward]
Beginning Balance	$ 27,377	$ 28,730
Foreign currency translation adjustments	785	(1,353)
Ending Balance	$ 28,162	27,377	$ 28,730
Discounted cash flow sensitivity analysis discount rate rncrease	1.00%
Europe
Goodwill [Roll Forward]
Beginning Balance	$ 353,896	372,553
Foreign currency translation adjustments	(8,655)	(18,657)
Ending Balance	$ 345,241	$ 353,896	$ 372,553
Discounted cash flow sensitivity analysis discount rate rncrease	1.00%

Goodwill, Impairment Test, Debt Instrument, Term

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Goodwill, Impairment Test, Discounted Cash Flow, Discount Rate

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Goodwill, Impairment Test, Discounted Cash Flow, Sensitivity Analysis, Discount Rate Increase

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Goodwill, Impairment Test, US Treasury Securities, Maturity Term

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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