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Employee Stock Plans - Additional Information (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) item $ / shares shares | Sep. 30, 2020 USD ($)
Additional Employee Stock Plans Information |  |  |  |
Income tax expense (benefit) | $ 1,204 | $ 3,234 | $ 1,943 | $ (17,484)
Performance Share Unit Awards | 2010 Plan |  |  |  |
Additional Employee Stock Plans Information |  |  |  |
fair value per share of the awards | $ / shares |  |  | $ 49.96 |
Compensation expenses recognized | (290) | (15) | $ 2,984 | 737
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest | 1,963 |  | $ 1,963 |
Performance period |  |  | 3 years |
Restricted stock units |  |  |  |
Additional Employee Stock Plans Information |  |  |  |
fair value per share of the awards | $ / shares |  |  | $ 44.49 |
Compensation expenses recognized | 295 | 214 | $ 3,041 | 2,031
Restricted stock units | Nonemployee Director [Member] |  |  |  |
Additional Employee Stock Plans Information |  |  |  |
Number of shares issued upon exercise of units other than options | shares |  |  | 1 |
Restricted stock units | 2010 Plan |  |  |  |
Additional Employee Stock Plans Information |  |  |  |
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest | 1,751 |  | $ 1,751 |
Minimum age of employee, attaining which awards are continued to be vested upon retirement | item |  |  | 65 |
Minimum service period, upon serving which awards are continued to be vested upon retirement |  |  | 10 years |
Minimum age of employee along with service period condition, attaining which awards are continued to be vested upon retirement | item |  |  | 55 |
Maximum period following a termination of service in which the share-based award will be settled |  |  | 2 months 15 days |
Restricted stock units | 2010 Plan | Management |  |  |  |
Additional Employee Stock Plans Information |  |  |  |
Accelerated stock based compensation expense | $ 0 | $ 21 | $ 618 | $ 983
Restricted stock units | 2010 Plan | Common Stock |  |  |  |
Additional Employee Stock Plans Information |  |  |  |
Number of shares issued upon exercise of units other than options | shares |  |  | 1 |

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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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