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Leases - Operating Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating Lease Cost
Operating lease expense	$ 3,803	$ 3,945	$ 13,280	$ 10,394
Sublease Income	143	0	143	0
Compensation and benefits
Operating Lease Cost
Operating lease expense	128	117	388	350
Occupancy
Operating Lease Cost
Operating lease expense	3,736	3,739	12,801	9,793
Communication and technology
Operating Lease Cost
Operating lease expense	$ 82	$ 89	234	$ 251
Abandonment of leased office space | Occupancy
Operating Lease Cost
Operating lease expense			$ 1,500

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+ References

No definition available.

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- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971

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- Definition

Amount of sublease income excluding finance and operating lease expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
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-Paragraph 4
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-Publisher FASB
-Name Accounting Standards Codification
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-Section 55
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-URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971

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