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Share-based Compensation - Restricted and Deferred Stock Units (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jul. 07, 2020 | Feb. 05, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Restricted stock unit |  |  |  |  |  |
Shares |  |  |  |  |  |
Non-vested at beginning of year (in shares) |  |  |  |  | 778,317 |
Granted (in shares) |  |  |  |  | 384,343 |
Dividend equivalents earned (in shares) |  |  |  |  | 29,265 |
Vested (in shares) |  |  |  |  | (117,641) |
Forfeited (in shares) |  |  |  |  | (66,132) |
Non-vested at end of year (in shares) |  |  | 1,008,152 |  | 1,008,152 |
Outstanding at end of year (in shares) |  |  | 1,008,152 |  | 1,008,152 |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |
Non-vested at beginning of year (in dollars per share) |  |  |  |  | $ 27.27 |
Granted (in dollars per share) |  |  |  |  | 17.26 |
Dividend equivalents earned (in dollars per share) |  |  |  |  | 19.21 |
Vested (in dollars per share) |  |  |  |  | 21.38 |
Forfeited (in dollars per share) |  |  |  |  | 26.42 |
Non-vested at end of year (in dollars per share) |  |  | $ 23.97 |  | 23.97 |
Outstanding at end of year (in dollars per share) |  |  | $ 23.97 |  | $ 23.97 |
Deferred stock units |  |  |  |  |  |
Shares |  |  |  |  |  |
Non-vested at beginning of year (in shares) |  |  |  |  | 21,261 |
Granted (in shares) |  |  |  |  | 33,419 |
Dividend equivalents earned (in shares) |  |  |  |  | 3,235 |
Vested (in shares) |  |  |  |  | (24,066) |
Non-vested at end of year (in shares) |  |  | 33,849 |  | 33,849 |
Outstanding at end of year (in shares) |  |  | 70,186 |  | 70,186 |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |
Non-vested at beginning of year (in dollars per share) |  |  |  |  | $ 26.78 |
Granted (in dollars per share) |  |  |  |  | 17.17 |
Dividend equivalents earned (in dollars per share) |  |  |  |  | 19.35 |
Vested (in dollars per share) |  |  |  |  | 25.95 |
Non-vested at end of year (in dollars per share) |  |  | $ 17.17 |  | 17.17 |
Outstanding at end of year (in dollars per share) |  |  | $ 24.41 |  | $ 24.41 |
Performance based restricted stock unit |  |  |  |  |  |
Shares |  |  |  |  |  |
Granted (in shares) |  |  | 15,724 |  |  |
Additional disclosures |  |  |  |  |  |
Compensation expense recognized |  |  | $ 300,000 |  |  |
Performance based restricted stock unit | Minimum |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |
Vesting percentage (as a percent) |  |  | 0.00% |  |  |
Performance based restricted stock unit | Maximum |  |  |  |  |  |
Shares |  |  |  |  |  |
Granted (in shares) |  |  | 25,158 |  |  |
Additional disclosures |  |  |  |  |  |
Vesting percentage (as a percent) |  |  | 160.00% |  |  |
RSUs and DSUs |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |
Compensation expense recognized |  |  | $ 2,200,000 | $ 1,200,000 | $ 4,400,000 | $ 3,100,000
Amount of compensation cost to be recognized |  |  | $ 13,400,000 |  | $ 13,400,000 |
Period over which cost will be recognized |  |  |  |  | 3 years |
Employee stock purchase plan |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |
Remaining shares available for issuance |  |  | 18,711 |  | 18,711 |
Stock option awards |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |
Compensation expense recognized |  |  | $ 0 |  | $ 0 | $ 100,000
2010 Equity Incentive Plan | Restricted stock unit | Members of management |  |  |  |  |  |
Shares |  |  |  |  |  |
Granted (in shares) |  | 3,808 |  |  |  |
Additional disclosures |  |  |  |  |  |
Compensation expense recognized |  | $ 100,000 |  |  |  |
Period over which cost will be recognized |  | 3 years |  |  |  |
Vesting percentage (as a percent) |  | 100.00% |  |  |  |
2020 Equity Incentive Plan |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |
Remaining shares available for issuance |  |  | 1,429,696 |  | 1,429,696 |
2020 Equity Incentive Plan | Restricted stock unit | Management, Vice Chairman of Board |  |  |  |  |  |
Shares |  |  |  |  |  |
Granted (in shares) | 380,535 |  |  |  |  |
Additional disclosures |  |  |  |  |  |
Compensation expense recognized | $ 6,500,000 |  |  |  |  |
Vesting percentage (as a percent) | 100.00% |  |  |  |  |
2020 Equity Incentive Plan | Restricted stock unit | Management, Vice Chairman of Board | Minimum |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |
Period over which cost will be recognized | 1 year |  |  |  |  |
2020 Equity Incentive Plan | Restricted stock unit | Management, Vice Chairman of Board | Maximum |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |
Period over which cost will be recognized | 5 years |  |  |  |  |
2020 Equity Incentive Plan | Deferred stock units | Directors and Advisory Directors |  |  |  |  |  |
Shares |  |  |  |  |  |
Granted (in shares) | 33,419 |  |  |  |  |
Additional disclosures |  |  |  |  |  |
Compensation expense recognized | $ 600,000 |  |  |  |  |
Period over which cost will be recognized | 1 year |  |  |  |  |
Vesting percentage (as a percent) | 100.00% |  |  |  |  |

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