Stock-Based Compensation - Aggregate Intrinsic Value of Options (Details) - Stock Options - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Stock-based compensation
Aggregate intrinsic value of options exercised	$ 648	$ 864	$ 842	$ 16,923
Cash received from the exercise of stock options	$ 789	$ 418	$ 860	$ 3,341
Weighted average grant date fair value per option	$ 20.99	$ 30.24	$ 26.58	$ 40.76

Amount of cash inflow from exercise of option under share-based payment arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Section 50
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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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