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Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Oct. 24, 2017
Feb. 01, 2016
Dec. 21, 2015
Apr. 02, 2014
Feb. 20, 2013
Sep. 30, 2012
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]                  
Payments to acquire equity method investments             $ 0 $ 300 $ 950
Cost method investments             3,300 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   23.00%     22.00%        
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             100 200  
RallyPoint                  
Schedule of Equity Method Investments [Line Items]                  
Equity method investment, non-cash impairment             $ 500 $ 300  
Cost method investments, non-cash impairment $ 300   $ 3,500            
Ownership investment in RallyPoint     14.00%