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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2019
Summary of Significant Accounting Policies [Abstract] |
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] |
| June 30, 2019 |  | December 31, 2018
| (In thousands)
Cash and cash equivalents | $ | 243,684 |  |  | $ | 198,850 |
Restricted cash(1): |  |  |
Included in Other current assets | 5,716 |  |  | 7,007 |
Included in Deferred charges and other assets | 1,745 |  |  | 1,727 |
Total restricted cash | 7,461 |  |  | 8,734 |
Total cash, cash equivalents, and restricted cash | $ | 251,145 |  |  | $ | 207,584 |

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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
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