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Employee Stock Plans - Additional Information (Details) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2021 USD ($) item $ / shares shares | Mar. 31, 2020 USD ($)
Additional Employee Stock Plans Information |  |
Income tax expense (benefit) | $ (77) | $ (3,262)
Performance Share Unit Awards | 2010 Plan |  |
Additional Employee Stock Plans Information |  |
fair value per share of the awards | $ / shares | $ 49.96 |
Compensation expenses recognized | $ 811 | 484
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest | $ 4,807 |
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 | $ 1,154 | 884
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 | $ 3,575 |
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 | $ 859 | $ 303
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 service period, on serving 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 Number of shares issued for each share of restricted stock units that is exercised during the period. + 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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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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 (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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