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Shareholders' Equity - Plan Summary and Description (Details) - shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restricted Stock |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 0 | 0 | 100,000 | 300,000
RSUs |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 1,800,000 | 1,200,000 | 1,300,000 | 1,600,000
SSAR Awards |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 2,300,000 | 2,200,000 | 1,500,000 | 700,000
2016 Plan |  |  |  |
Information pertaining to stock based awards |  |  |  |
Exercisable period | 7 years |  |  |
Common stock authorized for issuance (in shares) | 2,500,000 |  |  |
Remaining shares of common stock available for future issuance (in shares) | 700,000 |  |  |
2016 Plan | Restricted Stock |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 0 |  |  |
2016 Plan | RSUs |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 1,500,000 |  |  |
2016 Plan | SSAR Awards |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 2,200,000 |  |  |
2006 Plan |  |  |  |
Information pertaining to stock based awards |  |  |  |
Common stock subject to outstanding awards (in shares) | 4,200,000 |  |  |
Remaining shares of common stock available for future issuance (in shares) | 0 |  |  |
2006 Plan | Restricted Stock |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 0 |  |  |
2006 Plan | RSUs |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 400,000 |  |  |
2006 Plan | SSAR Awards |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 100,000 |  |  |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: 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)(i) -URI http://asc.fasb.org/extlink&oid=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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