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Employee Stock Plans - Additional Information (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) item $ / shares shares | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) $ / shares | Jun. 30, 2019 USD ($)
Additional Employee Stock Plans Information |  |  |  |
Income tax benefit | $ (17,456) | $ 8,299 | $ (20,718) | $ 7,836
Performance Share Unit Awards | 2010 Plan |  |  |  |
Additional Employee Stock Plans Information |  |  |  |
Vesting period of awards | 2 years |  |  |
Compensation expenses recognized | $ 268 | 769 | 752 | 1,063
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest | $ 1,126 |  | $ 1,126 |
Performance period | 3 years |  |  |
Restricted stock units |  |  |  |
Additional Employee Stock Plans Information |  |  |  |
fair value per share of the awards | $ / shares | $ 53.50 |  | $ 50.26 |
Compensation expenses recognized | $ 933 | 713 |  |
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 |  |  | $ 1,817 | 1,473
Unrecognized compensation expense, net of expected forfeitures, calculated under the fair value method for shares expected to vest | $ 1,252 |  | 1,252 |
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 | $ 659 | $ 1,031 | $ 962 | $ 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 Represents the minimum age of employee, attaining which awards are continued to be vested upon retirement. + References No definition available. + Details
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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 Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + 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 Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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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