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Share and Incentive-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2016 | Jun. 30, 2018 | Sep. 30, 2018 | Oct. 01, 2016
Share and Incentive Based Compensation Arrangement |  |  |  |
Shares authorized for issuance |  |  |  | 4,600,000
Performance units weighted average grant date fair value | $ 100 |  |  |
Performance units weighted average grant date fair value aggregate intrinsic value |  |  | $ 4.8 |
Restricted Stock |  |  |  |
Share and Incentive Based Compensation Arrangement |  |  |  |
Compensation yet not yet recognized |  |  | $ 5.6 |
Compensation yet not yet recognized period |  |  | 2 years 4 months 24 days |
Aggregate intrinsic value of vested awards |  |  | $ 15.9 |
Restricted Stock | Minimum |  |  |  |
Share and Incentive Based Compensation Arrangement |  |  |  |
Vesting period |  |  | 1 year |
Restricted Stock | Maximum |  |  |  |
Share and Incentive Based Compensation Arrangement |  |  |  |
Vesting period |  | 3 years |  |
Performance Share Units |  |  |  |
Share and Incentive Based Compensation Arrangement |  |  |  |
Aggregate intrinsic value of vested awards |  |  | $ 2.7 |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(1) -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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