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Commitments and Contingencies Commitments and Contingencies (Details 1) - Capital contributions
$ in Thousands
Dec. 31, 2019
USD ($)
Other Commitments [Line Items]  
2020 $ 78,106
2021 39,997
2022 4,812
2023 852
2024 503
2025 and thereafter 4,943
Total $ 129,213