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Debt Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt [Abstract] |
Investments Classified by Contractual Maturity Date [Table Text Block] | Maturities over the next five years with respect to the Company’s debt as of December 31, 2017 are as follows:
Year Ending December 31, | Debt Maturities (In thousands)
2018 | $ | 259,930 |
2019 | 1,213 |
2020 | 1,693 |
2021 | 301,319 |
2022 | 866 |
Thereafter | 250,000 |
Total | $ | 815,021 |

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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