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Additional Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Supplemental Cash Flow Information [Abstract] |
Schedule of Cash Flow, Supplemental Disclosures | The following presents information about cash paid for interest, income taxes and other non-cash financing activities for the years ended December 31, 2017, 2016 and 2015 (in thousands):
| 2017 |  | 2016 |  | 2015
Cash paid during the year for: |  |  |  |  |
Interest | $ | 11,456 |  |  | $ | 11,033 |  |  | $ | 7,668 |
Income taxes | $ | 130,226 |  |  | $ | 129,540 |  |  | $ | 99,754 |
Non-cash financing activities: |  |  |  |  |
Assets acquired under capital lease obligations | $ | 1,252 |  |  | $ | 1,914 |  |  | $ | 3,847 |

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