Equity Compensation (Activity) (Details) - Stock options - $ / shares
|
|
3 Months Ended |
|
Jan. 01, 2017 |
Mar. 31, 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) |
|
(441,176)
|
|
| Expired (in shares) |
|
(36,828)
|
|
| Forfeited (in shares) |
|
(15,973)
|
|
| Balance at the end of the period (in shares) |
|
3,282,428
|
|
| Exercisable options (in shares) |
|
2,678,355
|
|
| Vested and expected to vest at the end of the period (in shares) |
|
3,282,428
|
|
| Weighted Average Exercise Price |
|
|
|
| Balance at the beginning of the period (in dollars per share) |
$ 11.55
|
$ 11.55
|
|
| Exercised (in dollars per share) |
|
8.01
|
|
| Expired (in dollars per share) |
|
16.66
|
|
| Forfeited (in dollars per share) |
|
16.70
|
|
| Balance at the end of the period (in dollars per share) |
|
11.94
|
|
| Exercisable options at the end of the period (in dollars per share) |
|
11.30
|
|
| Vested and expected to vest (in dollars per share) |
|
$ 11.94
|
|
| Weighted-Average Remaining Contractual Life |
|
|
|
| Exercisable options |
|
5 years 4 months 24 days
|
|
| Vested and expected to vest |
|
5 years 9 months 18 days
|
|
| 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
|
|
|