Equity Compensation (Activity) (Details) - Stock options - $ / shares
|
|
9 Months Ended |
|
Jan. 01, 2017 |
Sep. 30, 2017 |
Jun. 11, 2013 |
| Shares Subject to Options Outstanding |
|
|
|
| Balance at the beginning of the period (in shares) |
3,776,405
|
3,776,405
|
|
| Exercised (in shares) |
|
(1,111,583)
|
|
| Expired (in shares) |
|
(59,552)
|
|
| Forfeited (in shares) |
|
(26,045)
|
|
| Balance at the end of the period (in shares) |
|
2,579,225
|
|
| Exercisable options (in shares) |
|
2,201,595
|
|
| Vested and expected to vest at the end of the period (in shares) |
|
2,579,225
|
|
| Weighted Average Exercise Price |
|
|
|
| Balance at the beginning of the period (in dollars per share) |
$ 11.55
|
$ 11.55
|
|
| Exercised (in dollars per share) |
|
10.16
|
|
| Expired (in dollars per share) |
|
17.50
|
|
| Forfeited (in dollars per share) |
|
16.82
|
|
| Balance at the end of the period (in dollars per share) |
|
11.95
|
|
| Exercisable options at the end of the period (in dollars per share) |
|
11.58
|
|
| Vested and expected to vest (in dollars per share) |
|
$ 11.95
|
|
| Weighted-Average Remaining Contractual Life |
|
|
|
| Exercisable options |
|
5 years 2 months 12 days
|
|
| Vested and expected to vest |
|
5 years 6 months
|
|
| 2013 Plan |
|
|
|
| Stock options |
|
|
|
| Potential annual increase in shares authorized for issuance as a percentage of shares outstanding as of the preceding December 31 |
|
|
5.00%
|
| Increase in number of shares authorized for issuance |
1,186,489
|
|
|