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Basis of Presentation - Intangible Assets – Activity (Details) - 5 Arches, LLC $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Finite-lived Intangible Assets [Roll Forward]
Carrying Value at December 31, 2018	$ 0
Additions	24,800
Amortization Expense	(633)
Carrying Value at March 31, 2019	$ 24,167
Weighted Average Amortization Period (in years)	4 years
Broker network
Finite-lived Intangible Assets [Roll Forward]
Carrying Value at December 31, 2018	$ 0
Additions	18,100
Amortization Expense	(301)
Carrying Value at March 31, 2019	$ 17,799
Weighted Average Amortization Period (in years)	5 years
Non-compete agreements
Finite-lived Intangible Assets [Roll Forward]
Carrying Value at December 31, 2018	$ 0
Additions	2,900
Amortization Expense	(81)
Carrying Value at March 31, 2019	$ 2,819
Weighted Average Amortization Period (in years)	3 years
Management fee on existing assets under management
Finite-lived Intangible Assets [Roll Forward]
Carrying Value at December 31, 2018	$ 0
Additions	2,600
Amortization Expense	(217)
Carrying Value at March 31, 2019	$ 2,383
Weighted Average Amortization Period (in years)	1 year
Tradename
Finite-lived Intangible Assets [Roll Forward]
Carrying Value at December 31, 2018	$ 0
Additions	1,200
Amortization Expense	(34)
Carrying Value at March 31, 2019	$ 1,166
Weighted Average Amortization Period (in years)	3 years

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
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-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
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