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Supplemental Cash Flow Disclosures (Tables) | 12 Months Ended
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Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract] |
Cash Paid for Interest and Income Taxes | Cash paid for interest and income taxes during the years ended December 31, 2018, 2017 and 2016 were as follows (in thousands):
|  | 2018 |  |  | 2017 |  |  | 2016 |
Interest |  | $ | 6,340 |  |  | $ | 6,117 |  |  | $ | 6,019 |
Income taxes |  | $ | 15,327 |  |  | $ | 25,085 |  |  | $ | 19,314 |

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