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Shareholders' Equity - Plan Summary and Description (Details) - shares | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Restricted Stock |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 300,000 | 1,200,000 | 1,400,000 | 1,500,000
RSUs |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 1,600,000 | 1,200,000 | 700,000 | 800,000
SSAR Awards |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 700,000 | 300,000 | 200,000 | 200,000
2016 Plan |  |  |  |
Information pertaining to stock based awards |  |  |  |
Common stock authorized for issuance (in shares) | 2,500,000 |  |  |
Remaining shares of common stock available for future issuance (in shares) | 3,400,000 |  |  |
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) | 600,000 |  |  |
2016 Plan | SSAR Awards |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 400,000 |  |  |
2006 Plan |  |  |  |
Information pertaining to stock based awards |  |  |  |
Common stock subject to outstanding awards (in shares) |  | 2,200,000 |  |
Remaining shares of common stock available for future issuance (in shares) |  |  |  |
2006 Plan | Restricted Stock |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 300,000 |  |  |
2006 Plan | RSUs |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 900,000 |  |  |
2006 Plan | SSAR Awards |  |  |  |
Information pertaining to stock based awards |  |  |  |
Outstanding awards issued (in shares) | 300,000 |  |  |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6877327&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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