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Summary of Significant Accounting Policies (Details) - USD ($)
shares in Thousands
3 Months Ended 9 Months Ended
Jan. 01, 2019
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Equity Method Investment                
Loss on equity method investment         $ (359,000) $ 0    
Equity method investment   $ 8,641,000     8,641,000     $ 0
Health Insurance                
Risk of loss for each health insurance plan participant         $ 500,000      
Earnings per Share                
Common stock equivalents (in shares)   572   635 555 505    
Anti-dilutive common stock equivalents (in shares)   0   0 0 0    
Accounting Standards Update 2018-02                
New Accounting Standards                
Reclassification of stranded tax effects $ 168,000   $ 0          
WorkLLama                
Equity Method Investment                
Percent ownership of equity method investment             50.00%  
Loss on equity method investment   $ (400,000)     $ (400,000)      
Equity method investment   8,600,000     8,600,000      
Contingent payments liability, maximum   15,000,000.0     15,000,000.0      
Contingent payments liability   $ 1,500,000     $ 1,500,000