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Investments in Unconsolidated Subsidiaries - Equity Method Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Schedule of Equity Method Investments [Line Items] |  |
Total investment in unconsolidated subsidiaries | $ 1,295,088 | $ 1,317,705
Real estate investments (in projects and funds) |  |
Schedule of Equity Method Investments [Line Items] |  |
Total investment in unconsolidated subsidiaries | 632,050 | 622,826
Altus Power, Inc. |  |
Schedule of Equity Method Investments [Line Items] |  |
Total investment in unconsolidated subsidiaries | $ 179,376 | $ 219,624
Common stock shares (in shares) | 24,556,012 | 24,554,201
Altus Power, Inc. | Common Class A |  |
Schedule of Equity Method Investments [Line Items] |  |
Total investment in unconsolidated subsidiaries | $ 134,567 | $ 160,093
Shares converted to Class A common stock (in shares) | 2,011 |
Altus Power, Inc. | Common Class A | Parent Company |  |
Schedule of Equity Method Investments [Line Items] |  |
Shares converted to Class A common stock (in shares) | 1,811 |
Altus Power, Inc. | Alignment Share or Class B Common Shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Alignment shares converted (in shares) | 201,250 |
Other |  |
Schedule of Equity Method Investments [Line Items] |  |
Total investment in unconsolidated subsidiaries | $ 483,662 | 475,256
Alignment shares | Alignment Share or Class B Common Shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Total investment in unconsolidated subsidiaries | $ 44,809 | $ 59,530

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