Stock Based Compensation - Additional Information (Details) - USD ($)
$ in Millions |
|
12 Months Ended |
|
Feb. 05, 2019 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
May 30, 2017 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
| Stock-based compensation, capitalized amount |
|
$ 0.0
|
$ 0.0
|
$ 0.0
|
|
| Vesting period |
|
3 years
|
|
|
|
| Minimum |
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
| Stock distribution period |
|
30 days
|
|
|
|
| Maximum |
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
| Stock distribution period |
|
15 months
|
|
|
|
| Restricted Stock Units |
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
| Granted (in shares) |
|
67,000
|
|
|
|
| Total fair value of shares vested |
|
$ 4.0
|
4.0
|
3.0
|
|
| Unrecognized compensation cost (less than) |
|
$ 4.0
|
|
|
|
| Weighted-average period |
|
1 year 8 months 19 days
|
|
|
|
| Accrued dividend equivalents |
|
$ 1.0
|
1.0
|
1.0
|
|
| Performance Condition |
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
| Granted (in shares) |
|
145,000
|
|
|
|
| Vesting period |
|
3 years
|
|
|
|
| Total fair value of shares vested |
|
$ 14.0
|
$ 12.0
|
$ 13.0
|
|
| Unrecognized compensation cost (less than) |
|
$ 4.0
|
|
|
|
| Weighted-average period |
|
1 year 1 month 2 days
|
|
|
|
| Historical volatility, stock price, period |
|
3 years
|
|
|
|
| Expected term |
|
3 years
|
|
|
|
| 2017 Omnibus Equity Compensation Plan |
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
| Total shares authorized for grant (in shares) |
|
|
|
|
7,200,000
|
| Shares available for grant (in shares) |
|
6,800,000
|
|
|
|
| 2007 Omnibus Equity Compensation Plan | Stock Options |
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
| Granted (in shares) |
|
0
|
0
|
0
|
|
| Vesting period |
|
3 years
|
|
|
|
| Total fair value of shares vested |
|
$ 1.0
|
$ 1.0
|
$ 2.0
|
|
| Unrecognized compensation cost (less than) |
|
$ 0.0
|
|
|
|
| Weighted-average period |
|
1 year
|
|
|
|
| 2007 Omnibus Equity Compensation Plan | Stock Options | Minimum |
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
| Vesting period |
|
1 year
|
|
|
|
| 2007 Omnibus Equity Compensation Plan | Restricted Stock Units | Minimum |
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
| Vesting period |
|
1 year
|
1 year
|
1 year
|
|
| 2007 Omnibus Equity Compensation Plan | Restricted Stock Units | Maximum |
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
| Vesting period |
|
3 years
|
3 years
|
3 years
|
|
| Employee Stock Purchase Plan |
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
| Shares available for grant (in shares) |
|
1,800,000
|
|
|
|
| Lesser of fair market value |
85.00%
|
|
|
|
|
| Stock issuable (in shares) |
|
2,000,000.0
|
|
|
|
| Shares issued (in shares) |
|
88,000
|
95,000
|
93,000
|
|