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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 |  |

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