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Employee Stock Plans - Additional Information (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) item $ / shares shares | Sep. 30, 2019 USD ($)
Additional Employee Stock Plans Information |  |  |  |
Income tax expense (benefit) | $ 3,234 | $ 3,113 | $ (17,484) | $ 10,949
Performance Share Unit Awards | 2010 Plan |  |  |  |
Additional Employee Stock Plans Information |  |  |  |
Vesting period of awards |  |  | 2 years |
fair value per share of the awards | $ / shares |  |  | $ 53.50 |
Compensation expenses recognized | (15) | 338 | $ 737 | 1,401
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest | 753 |  | $ 753 |
Performance period |  |  | 3 years |
Restricted stock units |  |  |  |
Additional Employee Stock Plans Information |  |  |  |
fair value per share of the awards | $ / shares |  |  | $ 50.20 |
Compensation expenses recognized | 214 | 187 |  |
Restricted stock units | Non-employee director |  |  |  |
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 |  |  |  |
Compensation expenses recognized |  |  | $ 2,031 | 1,660
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest | 1,098 |  | $ 1,098 |
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 | $ 21 | $ 0 | $ 983 | $ 1,374
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 Represents the minimum age of employee along with service period condition, attaining which awards are continued to be vested upon retirement. + References No definition available. + Details
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- Definition Maximum period following a termination of service by the plan participant in which the share-based award will be settled. + References No definition available. + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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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=116856206&loc=d3e5070-113901 + Details
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