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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Restrictions on Cash and Cash Equivalents | The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the Consolidated Balance Sheets that sum to the total of the same such amounts shown in the Consolidated Statements of Cash Flows:
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (in thousands)
Cash and cash equivalents | $ | 120,221 |  |  | $ | 176,274 |  |  | $ | 133,565 |
Current restricted cash included in other current assets | 51 |  |  | 51 |  |  | — |
Long-term restricted cash | 2,056 |  |  | 311,010 |  |  | — |
Total cash, cash equivalents, and restricted cash: | $ | 122,328 |  |  | $ | 487,335 |  |  | $ | 133,565 |

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