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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2018
Subsequent Event [Line Items]
Subsequent Events [Text Block]	Subsequent Event On January 25, 2019, the Company acquired all of the outstanding shares of DHA Group, Inc. ("DHA"), headquartered in Washington, D.C., for $46.0 million in cash. DHA is a provider of mobility, cybersecurity, cloud and IT services to the Federal Bureau of Investigation and other federal customers. DHA was acquired to expand the Company's government services and is part of the ECS segment.