Stockholders' Equity - Narrative (Details) |
9 Months Ended |
|---|---|
|
Sep. 30, 2018
$ / shares
shares
| |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Outstanding options that are exercisable (shares) | 1,300,000 |
| Outstanding options that are exercisable, weighted average exercise price (USD per share) | $ / shares | $ 43.98 |
| Employee Stock Purchase Plan | |
| Employee Stock Purchase Plan | |
| Share purchase price as percent of market price (as a percent) | 85.00% |
| Shares available for future purchases (shares) | 65,007 |
| X | ||||||||||
- Definition Employee Stock Purchase Plan [Abstract] No definition available.
|
| X | ||||||||||
- Definition Number of shares to be repurchased in accordance with a policy to use treasury stock to satisfy share-award conversions. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Discount rate from fair value on purchase date that participants pay for shares. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| 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 | ||||||||||
- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|