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Additional Cash Flow Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 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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