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Debt (Details) - Amended 2017 Margin Loan Agreement $ in Thousands |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 24, 2018 USD ($) | Mar. 21, 2016 loan | Oct. 30, 2014 loan | Jun. 30, 2019 USD ($) shares | Dec. 31, 2018 USD ($)
Charter |  |  |  |  |
Debt disclosures |  |  |  |  |
Number of common shares pledged as collateral | shares |  |  |  | 6,800,000 |
Value of pledged collateral |  |  |  | $ 2,700,000 |
SPV |  |  |  |  |
Debt disclosures |  |  |  |  |
Number of debt agreements repaid | loan |  | 2 | 2 |  |
Maximum borrowing capacity | $ 1,000,000 |  |  |  |
Additional allowed borrowing capacity | $ 1,000,000 |  |  |  |
Remaining borrowing capacity |  |  |  | $ 475,000 |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 3.83% |
Amount outstanding |  |  |  | $ 525,000 | $ 525,000
SPV | Three-month LIBOR |  |  |  |  |
Debt disclosures |  |  |  |  |
Interest rate basis | three-month LIBOR |  |  |  |
Basis spread on variable rate | 1.50% |  |  |  |

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