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Subsequent Event (Notes)	12 Months Ended
Subsequent Event (Notes)	Dec. 31, 2017
Subsequent Event [Line Items]
Subsequent Events [Text Block]	(16) Subsequent Event On January 2, 2018, we acquired the business and certain assets of Hula Partners, a provider of SAP SuccessFactors Human Capital Management (HCM) implementation services with headquarters in Houston, Texas. The purchase price was $10.0 million in cash. The results of Hula Partners' operations will be included in the consolidated financial statements beginning January 2, 2018.