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Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation cost related to nonvested awards |  |  | $ 7,253 | $ 5,621 |
Dividends declared not paid on restricted stock units | $ 139 | $ 168 | $ 139 | 168 |
Award vesting, percentage |  |  | 181.00% |  |
Maximum worth of award per participant |  |  | $ 25 |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Fair value of restricted stock units vested and released | 3,549 | 1,488 | 4,597 | 6,503 |
Compensation cost related to nonvested awards | 4,651 | 1,836 | $ 6,666 | $ 5,621 |
Granted (in shares) |  |  | 353,891,000 | 167,343,000 |
Restricted Stock Units (RSUs) | Director |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation cost related to nonvested awards | 237 | $ 186 | $ 615 | $ 537 |
Stock-Settled EBI Units and Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost related to nonvested awards | 14,533 |  | $ 14,533 |  | $ 11,499
Expected weighted-average period to be recognized |  |  | 2 years 3 months 3 days |  | 2 years
Dividends declared not paid on restricted stock units | 533 |  | $ 533 |  | $ 375
Performance Based Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation cost related to nonvested awards | 171 |  | 587 |  |
Unrecognized compensation cost related to nonvested awards | $ 2,775 |  | $ 2,775 |  |
Expected weighted-average period to be recognized |  |  | 2 years 4 months 24 days |  |
Criteria period |  |  | 3 years |  |
Vesting period |  |  | 3 years |  |
Granted (in shares) |  |  | 53,147 |  |
Employee Stock Purchase Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Purchase price percentage of subsequent offering periods |  |  | 95.00% |  |
Maximum number of shares issuable (in shares) | 200,000 |  | 200,000 |  |
Maximum number of shares per participant (in shares) |  |  | 725 |  |
Shares issued under plan (in shares) | 18,034,000 | 12,558,000 | 30,179,000 | 23,171,000 |
Number of shares reserved for issuance (in shares) | 2,379,006 |  | 2,379,006 |  | 2,409,185
Minimum | Performance Based Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Core return threshold percentages |  |  | 0.00% |  |
Maximum | Performance Based Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Core return threshold percentages |  |  | 200.00% |  |

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