Subsequent Events (Details) - DHA [Member] - Subsequent Event [Member] $ in Millions	Jan. 25, 2019 USD ($)
Subsequent Event [Line Items]
Business Acquisition, Effective Date of Acquisition	Jan. 25, 2019
Business Acquisition, Name of Acquired Entity	DHA Group, Inc.
Business Acquisition, Description of Acquired Entity	headquartered in Washington, D.C.
Payments to Acquire Businesses, Gross	$ 46.0
Business Combination, Reason for Business Combination	DHA was acquired to expand the Company's government services