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Share-Based Compensation | 3 Months Ended
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Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-Based Compensation | Share-Based Compensation We have certain share-based compensation plans. Under the fair value method, compensation cost is measured at the grant date based on the fair value of the award and is recognized over the service period which generally corresponds to the vesting period. Awards under our plans generally vest over periods ranging from one to three years. Table 14.1 shows the number of shares granted to employees and the weighted average fair value per share during the periods presented (shares in thousands).
| Table | 14.1 |  |  |  |  |  |  |
Restricted stock grants |  |  | Three months ended March 31,
|  | 2018 |  | 2017
|  |  | Shares Granted |  | Weighted Average Share Fair Value |  | Shares Granted |  | Weighted Average Share Fair Value
| RSUs subject to performance conditions | 1,239 |  |  | $ | 15.80 |  |  | 1,237 |  |  | $ | 10.41 |
| RSUs subject only to service conditions | 412 |  |  | 15.71 |  |  | 395 |  |  | 10.41 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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