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SUPPLEMENTAL CASH FLOW INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2017
Supplemental Cash Flow Information | Supplemental cash flow information was as follows:
Years Ended December 31, |  | 2017 |  |  | 2016 |  |  | 2015 |
Interest paid |  | $ | 5,773 |  |  | $ | 3,362 |  |  | $ | 4,993 |
Income taxes net of refunds |  | $ | 48,056 |  |  | $ | 99,006 |  |  | $ | 103,261 |

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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
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