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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, 2018
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 |  | 4.00x
1 | The interest coverage ratio is defined as EBITDA, as defined in the Credit Agreement and Term Loan 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 Amended Credit Agreement and Term Loan Agreement, for the four quarters then ended.

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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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