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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 Share-based compensation expense was as follows:
| For the three months ended June 30, |  | For the six months ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Stock options, net of estimated forfeitures | $ | 2,074 |  |  | $ | 9,550 |  |  | $ | (5,092 | ) |  | $ | 28,831 |
Restricted stock awards | 5,613 |  |  | 3,399 |  |  | 9,023 |  |  | 6,506 |
Total | $ | 7,687 |  |  | $ | 12,949 |  |  | $ | 3,931 |  |  | $ | 35,337 |
The negative stock options expense for the six months ended June 30, 2018 relates to the correction of an immaterial error recorded in the prior year.

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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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