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Commitments and Contingencies (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jul. 01, 2017
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |
Contingent consideration, liability | $ 8,903,000 | $ 7,419,000 |  |
Office leases |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Rent expense | 10,500,000 | $ 13,700,000 | $ 5,600,000 |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |
2019 | 9,380,000 |  |  |
2020 | 9,007,000 |  |  |
2021 | 8,617,000 |  |  |
2022 | 7,602,000 |  |  |
2023 | 7,045,000 |  |  |
2024 and thereafter | 29,615,000 |  |  |
Total | $ 71,266,000 |  |  |
THL Hotel Portfolio | Maximum |  |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |
Contingent consideration, liability |  |  |  | $ 13,000,000.0

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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
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