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Share-Based Compensation | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-Based Compensation | Share-Based Compensation The amount of compensation cost for share-based awards to be recognized during a period is based on the portion of the awards that are ultimately expected to vest. The Company estimates forfeitures at the time of grant and revises those estimates in subsequent periods if actual forfeitures differ from those estimates. The Company analyzes historical data to estimate pre-vesting forfeitures and records share-based compensation expense for those awards expected to vest. Total share-based compensation expenses were comprised as follows (in thousands):
| Three months ended June 30, |  | Six months ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Option plan | $ | 6,758 |  |  | $ | 5,649 |  |  | $ | 9,815 |  |  | $ | 7,071 |
Other share-based awards | 13,847 |  |  | 13,018 |  |  | 19,736 |  |  | 22,110 |
Total share-based compensation before tax | 20,605 |  |  | 18,667 |  |  | 29,551 |  |  | 29,181 |
Tax benefit | 4,904 |  |  | 6,933 |  |  | 7,033 |  |  | 10,838 |
Total share-based compensation expense included in net income | $ | 15,701 |  |  | $ | 11,734 |  |  | $ | 22,518 |  |  | $ | 18,343 |
In addition to the above share-based compensation expenses, Polaris sponsors a qualified non-leveraged employee stock ownership plan (ESOP). Shares allocated to eligible participants’ accounts vest at various percentage rates based on years of service and require no cash payments from the recipient. At June 30, 2018, there was $134,342,000 of total unrecognized share-based compensation expense related to unvested share-based equity awards. Unrecognized share-based compensation expense is expected to be recognized over a weighted-average period of 1.67 years. Included in unrecognized share-based compensation expense is approximately $37,441,000 related to stock options and $96,901,000 for restricted stock.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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