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Basis of Presentation - Accounting for Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Sep. 30, 2017
Stock-based compensation activity, including both continuing and discontinued operations        
Stock-based compensation expense recognized in operating expenses $ 3,100 $ 8,000    
Proceeds to the Company from the exercise of stock-based compensation 695 $ 314    
Tax effect from the exercise of stock-based compensation, including shortfall tax benefits (1) 792      
Fair value of financial instruments        
Money Market Funds 5,437   $ 5,293 $ 3,545
Contingent Consideration $ 1,401      
Income Taxes        
Effective tax rate (as a percent) 22.20% 24.90%    
Provision for income taxes $ 7,253 $ 7,680