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Basis of Presentation - Accounting for Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Stock-based compensation activity, including both continuing and discontinued operations          
Stock-based compensation expense recognized in operating expenses $ 2,800 $ 600 $ 8,800 $ 11,800  
Proceeds to the Company from the exercise of stock-based compensation     695 3,566  
Tax effect from the exercise of stock-based compensation, including shortfall tax benefits (1)     791    
Fair value of financial instruments          
Money Market Funds 7,618 $ 5,409 7,618 $ 5,409 $ 5,293
Contingent Consideration $ 1,100   $ 1,100    
Income Taxes          
Effective tax rate (as a percent) 27.10% 37.00% 26.10% 34.00%  
Provision for income taxes $ 16,473 $ 16,581 $ 40,202 $ 40,972  
Minimum          
Stock-Based Compensation          
Vesting period     3 years    
Maximum          
Stock-Based Compensation          
Vesting period     4 years