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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Estimated Fair Values of Financial Instruments | The estimated fair values of our financial instruments as of our balance sheet dates are presented below:
|  | December 31,
|  | 2017 |  | 2016
(In thousands) |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Cash and cash equivalents (Level 1) |  | $ | 15,738 |  |  | $ | 15,738 |  |  | $ | 23,001 |  |  | $ | 23,001 |
Borrowings under revolving credit facilities (Level 2) |  | 155,000 |  |  | 154,882 |  |  | 135,000 |  |  | 135,000 |
Long-term debt (Level 2) |  | 575,000 |  |  | 569,250 |  |  | 575,000 |  |  | 567,875 |

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