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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, 2019
Schedule of Line of Credit Facility [Abstract] |
Schedule of Financial Covenants in Credit Agreement [Table Text Block] | In addition to other and customary covenants, we are required to maintain the financial covenant listed below as of the end of each fiscal quarter for the period of four fiscal quarters then ended pursuant to our Credit Agreement. We were in compliance with our covenant in the Credit Agreement as of December 31, 2019.
|  | Financial Covenants 1
Leverage ratio (not greater than): 1 |  | 3.75x
1 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. Pursuant to July 2018 Amendment No. 1 to the Credit Agreement, the maximum leverage ratio decreased from 4.00x to 3.75x on the last day of the fourth full fiscal quarter ending after the Acxiom closing date on October 1, 2018.

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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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