Summary of Restricted Stock Unit Activity (Parenthetical) (Details) - shares shares in Thousands |
1 Months Ended | 9 Months Ended |
|---|---|---|
Jan. 31, 2016 |
Sep. 30, 2016 |
|
| 2013 RSUs | ||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||
| Shares vested | 128 | 202 |
| RSUs Without Performance Conditions | ||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||
| Shares vested | 49 |