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Basis of Presentation of Interim Period Statements (Tables) | 6 Months Ended
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Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Schedule of Reconciles of Cash, Cash Equivalents and Restricted Cash Balances | The table below reconciles the cash, cash equivalents and restricted cash balances from our condensed consolidated balance sheets to the amounts reported on the condensed consolidated statements of cash flows (in thousands):
|  | June 30, |  |  | December 31, |  |  | June 30, |  |  | December 31, |
|  | 2019 |  |  | 2018 |  |  | 2018 |  |  | 2017 |
Cash and cash equivalents |  | $ | 23,693 |  |  | $ | 35,371 |  |  | $ | 33,786 |  |  | $ | 59,835 |
Restricted cash, included in restricted cash and investments |  |  | 193,596 |  |  |  | 105,331 |  |  |  | 24,862 |  |  |  | 60,370 |
Total cash, cash equivalents and restricted cash shown in the statement of cash flows |  | $ | 217,289 |  |  | $ | 140,702 |  |  | $ | 58,648 |  |  | $ | 120,205 |
Summary of Basic and Diluted Common Shares Outstanding | Basic and diluted shares outstanding are summarized as follows (in thousands):
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Weighted average number of basic shares outstanding |  |  | 7,410 |  |  |  | 7,310 |  |  |  | 7,408 |  |  |  | 7,307 |
Effect of dilutive securities |  |  | 282 |  |  |  | 365 |  |  |  | 266 |  |  |  | 351 |
Weighted average number of diluted shares outstanding |  |  | 7,692 |  |  |  | 7,675 |  |  |  | 7,674 |  |  |  | 7,658 |

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