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Debt and Credit Agreements Schedule of Financial Covenants in Credit Agreement (Tables) | 12 Months Ended
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Dec. 31, 2017
Schedule of Line of Credit Facility [Abstract] |
Schedule of Financial Covenants in Credit Agreement [Table Text Block] |
Interest coverage ratio (not less than): 1 |  | 5.00x
Leverage ratio (not greater than): 2 |  | 3.50x
1 | The interest coverage ratio is defined as EBITDA, as defined in the Credit Agreement, to net interest expense for the four quarters then ended.
2 | The leverage ratio is defined as debt as of the last day of such fiscal quarter to EBITDA, as defined in the Credit Agreement, for the four quarters then ended. The leverage ratio may be changed to not more than 4.00 to 1 at our election for four consecutive fiscal quarters, beginning with the fiscal quarter in which there is an occurrence of one or more acquisitions with an aggregate purchase price of at least $200.0.

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- Definition Tabular disclosure of financial covenants in the credit agreement by quarter, including interest coverage ratio, leverage ratio and minimum EBITDA. + References No definition available. + Details
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- Definition Schedule of Line of Credit Facility [Abstract] + References No definition available. + Details
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