Summary of Restricted Stock Unit Activity (Details) - Restricted Stock Units
shares in Thousands |
9 Months Ended |
|
Sep. 30, 2016
$ / shares
shares
|
|---|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
|
|
| Non-vested total as of January 1, 2016 | shares |
436
|
|
| Granted | shares |
143
|
|
| Performance share adjustment | shares |
74
|
|
| Vested | shares |
(251)
|
[1] |
| Forfeited | shares |
(24)
|
|
| Non-vested total as of September 30, 2016 | shares |
378
|
|
| Weighted-average grant date fair value (per share), non-vested total beginning balance | $ / shares |
$ 46.97
|
|
| Weighted-average grant date fair value (per share), granted | $ / shares |
69.73
|
|
| Weighted-average grant date fair value (per share), Performance share adjustment | $ / shares |
39.89
|
|
| Weighted-average grant date fair value (per share), vested | $ / shares |
42.60
|
|
| Weighted-average grant date fair value (per share), forfeited | $ / shares |
60.84
|
|
| Weighted-average grant date fair value (per share), non-vested total ending balance | $ / shares |
$ 56.19
|
|
|
|