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Fair Values of Financial Instruments - Assets, Liabilities and Temporary Equity Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Investments in equity securities | $ 44,077 | $ 39,951
Liabilities |  |
Contingent earn-out obligations | 42,378 |
Fair Value, Measurements, Recurring |  |
Assets |  |
Investments in equity securities | 44,077 | 39,951
Liabilities |  |
Contingent earn-out obligations | 30,248 | 24,586
Temporary equity |  |
Noncontrolling interests subject to put provisions | 1,330,028 | 1,180,376
Fair Value, Measurements, Recurring | Interest rate cap agreements |  |
Assets |  |
Interest rate cap agreements | 2,671 | 24,452
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Investments in equity securities | 44,077 | 39,951
Liabilities |  |
Contingent earn-out obligations | 0 | 0
Temporary equity |  |
Noncontrolling interests subject to put provisions | 0 | 0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Interest rate cap agreements |  |
Assets |  |
Interest rate cap agreements | 0 | 0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) |  |
Assets |  |
Investments in equity securities | 0 | 0
Liabilities |  |
Contingent earn-out obligations | 0 | 0
Temporary equity |  |
Noncontrolling interests subject to put provisions | 0 | 0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Interest rate cap agreements |  |
Assets |  |
Interest rate cap agreements | 2,671 | 24,452
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) |  |
Assets |  |
Investments in equity securities | 0 | 0
Liabilities |  |
Contingent earn-out obligations | 30,248 | 24,586
Temporary equity |  |
Noncontrolling interests subject to put provisions | 1,330,028 | 1,180,376
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Interest rate cap agreements |  |
Assets |  |
Interest rate cap agreements | $ 0 | $ 0

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