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Debt Securities - Narrative (Details) - N-Star CDO bonds $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) security
Debt Securities, Available-for-sale [Line Items] |
Gain upon deconsolidation | $ | $ 10.9
Commercial Real Estate, Securities | Colony NorthStar |
Debt Securities, Available-for-sale [Line Items] |
Weighted average maturity of securities acquired | 5 years
Commercial Real Estate, Securities | Colony NorthStar | Minimum |
Debt Securities, Available-for-sale [Line Items] |
Contractual maturity period | 8 years
Commercial Real Estate, Securities | Colony NorthStar | Maximum |
Debt Securities, Available-for-sale [Line Items] |
Contractual maturity period | 43 years
Consolidated Properties | Commercial Real Estate, Securities | Colony NorthStar |
Debt Securities, Available-for-sale [Line Items] |
Number of securities acquired | security | 2

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