Share-Based Awards and Cash-Based Awards - Schedule of Restricted Stock Awards Outstanding (Details) - Restricted Shares - shares |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|---|---|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||
| Awards expected to vest by period | 246,528 | 161,296 | 78,230 | 43,210 |
| 2018 | ||||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||
| Awards expected to vest by period | 106,240 | |||
| 2019 | ||||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||
| Awards expected to vest by period | 91,164 | |||
| 2020 | ||||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||
| Awards expected to vest by period | 49,124 |
| X | ||||||||||
- 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
|
| X | ||||||||||
- 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.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|