Share-Based Awards and Cash-Based Awards - Schedule of Restricted Stock Units Outstanding (Details) - Restricted Stock Units (RSUs) - shares |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||
| Awards expected to vest by period | 5,765,251 | 6,107,248 | 3,474,079 | 1,977,335 |
| 2018 | ||||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||
| Awards expected to vest by period | 3,742,509 | |||
| 2019 | ||||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||
| Awards expected to vest by period | 2,022,742 |
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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. No definition available.
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