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Investments (Details) - USD ($) $ in Thousands						12 Months Ended
Investments (Details) - USD ($) $ in Thousands	Feb. 01, 2016	Dec. 21, 2015	Apr. 02, 2014	Feb. 20, 2013	Sep. 30, 2012	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments						$ 300	$ 950	$ 3,871
Cost method investments, non-cash impairment						300
Cost method investments						$ 3,800	3,800
NWHW holdings
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments					$ 6,800
Percentage of fully diluted equity					20.00%
Proceeds from equity method investment, dividends							$ 3,000
Fidelis Education
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments	$ 950			$ 4,000
Percentage of fully diluted equity				22.00%		23.00%
Equity method investment, non-cash impairment						$ 2,200
Second Avenue Software
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments			$ 1,500
Percentage of fully diluted equity			26.00%
Equity method investment, non-cash impairment						$ 200
RallyPoint
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments		$ 3,500
Percentage of fully diluted equity		14.00%