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Share-Based Compensation Plans - Additional Information (Details) shares in Thousands, $ in Thousands | 1 Months Ended | 9 Months Ended
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Aug. 31, 2019 director | Sep. 30, 2019 USD ($) item shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of new nonemployee directors | director | 2 |
Share-based Payment Arrangement, Nonemployee [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares granted |  | 3
Vesting period | 1 year | 1 year
2017 Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares available for grant |  | 1,762
Maximum [Member] | 2017 Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares available for grant |  | 3,000
Restricted Stock Grants [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares granted |  | 152
Shares withheld for taxes |  | 68
Common stock in lieu of taxes | $ |  | $ 8,127
Forfeiture of shares by transferred employees at closing of transaction |  | 15
Restricted Stock Grants [Member] | 2008 Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares granted |  | 149
Vesting period |  | 5 years
Number of anniversaries of the vesting date following the date of grant | item |  | 4
Restricted Stock Grants [Member] | Share-based Compensation Award, Tranche One [Member] | 2008 Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting right percentage |  | 20.00%
Restricted Stock Grants [Member] | Share-based Compensation Award, Tranche Two [Member] | 2008 Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting right percentage |  | 20.00%
Restricted Stock Grants [Member] | Share-based Compensation Award, Tranche Three [Member] | 2008 Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting right percentage |  | 20.00%
Restricted Stock Grants [Member] | Share-based Compensation Award Tranche Four [Member] | 2008 Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting right percentage |  | 20.00%
Restricted Stock Grants [Member] | Share-based Compensation Award Tranche Five [Member] | 2008 Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting right percentage |  | 20.00%
Employee Stock Option [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options granted |  | 0

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- Definition The number of new nonemployee directors. + References No definition available. + Details
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- Definition Amount of decrease to equity for grantee's tax withholding obligation for award under share-based payment arrangement. + References No definition available. + 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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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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