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Equity Compensation and Other Benefit Plans - Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
RSUs With Service Condition |  |  |
RSUs With Service Condition |  |  |
Outstanding at beginning of year (in shares) | 1,829,455 | 1,379,681 | 1,206,446
Granted (in shares) | 1,517,069 | 939,046 | 461,525
Settled (in shares) | (497,974) | (379,272) | (269,290)
Cancelled, forfeited or expired (in shares) | 0 | (110,000) | (19,000)
Outstanding at end of year (in shares) | 2,848,550 | 1,829,455 | 1,379,681
RSUs vested but not settled at end of year (in shares) | 1,142,900 | 1,160,416 | 809,681
RSUs unvested at end of year (in shares) | 1,705,650 | 669,039 | 570,000
Weighted Average Grant Date Fair Value |  |  |
Outstanding at beginning of year (in dollars per share) | $ 6.19 | $ 7.62 | $ 7.57
Granted (in dollars per share) | 4.16 | 4.88 | 7.35
Settled (in dollars per share) | 6.49 | 7.75 | 6.93
Cancelled/forfeited (in dollars per share) | 0 | 7.59 | 7.72
Outstanding at end of year (in dollars per share) | 5.05 | 6.19 | 7.62
RSUs vested but not settled at end of year (in dollars per share) | 5.22 | 5.37 | 7.70
Weighted average grant date fair value (in dollars per share) | $ 4.94 | $ 7.61 | $ 7.50
RSUs With Market and Service Conditions |  |  |
RSUs With Service Condition |  |  |
Outstanding at beginning of year (in shares) | 1,623,174 | 1,301,250 | 1,151,250
Granted (in shares) | 2,408,520 | 763,174 | 451,000
Settled (in shares) | (409,000) | (441,250) | (290,000)
Cancelled, forfeited or expired (in shares) | 0 | 0 | (11,000)
Outstanding at end of year (in shares) | 3,622,694 | 1,623,174 | 1,301,250
RSUs vested but not settled at end of year (in shares) | 451,000 | 409,000 | 441,250
RSUs unvested at end of year (in shares) | 3,171,694 | 1,214,174 | 860,000
Weighted Average Grant Date Fair Value |  |  |
Outstanding at beginning of year (in dollars per share) | $ 6.26 | $ 6.78 | $ 6.21
Granted (in dollars per share) | 3.40 | 5.50 | 6.97
Settled (in dollars per share) | 6.91 | 6.48 | 4.81
Cancelled/forfeited (in dollars per share) | 0 | 0 | 6.71
Outstanding at end of year (in dollars per share) | 4.29 | 6.26 | 6.78
RSUs vested but not settled at end of year (in dollars per share) | 6.97 | 6.91 | 6.48
Weighted average grant date fair value (in dollars per share) | $ 3.90 | $ 6.04 | $ 6.94
Expected term | 1 year |  |
RSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost | $ 12.3 | $ 6.8 |
Period for recognizing unrecognized compensation cost | 1 year 9 months 18 days |  |
RSUs With Service Condition |  |  |
Outstanding at beginning of year (in shares) | 3,452,629 | 2,680,931 | 2,357,696
Granted (in shares) | 3,925,589 | 1,702,220 | 912,525
Settled (in shares) | (906,974) | (820,522) | (559,290)
Cancelled, forfeited or expired (in shares) | 0 | (110,000) | (30,000)
Outstanding at end of year (in shares) | 6,471,244 | 3,452,629 | 2,680,931
RSUs vested but not settled at end of year (in shares) | 1,593,900 | 1,569,416 | 1,250,931
RSUs unvested at end of year (in shares) | 4,877,344 | 1,883,213 | 1,430,000
Weighted Average Grant Date Fair Value |  |  |
Outstanding at beginning of year (in dollars per share) | $ 6.22 | $ 7.21 | $ 6.90
Granted (in dollars per share) | 3.69 | 5.16 | 7.16
Settled (in dollars per share) | 6.68 | 7.07 | 5.83
Cancelled/forfeited (in dollars per share) | 0 | 7.59 | 7.35
Outstanding at end of year (in dollars per share) | 4.62 | 6.22 | 7.21
RSUs vested but not settled at end of year (in dollars per share) | 5.72 | 5.77 | 7.27
Weighted average grant date fair value (in dollars per share) | $ 4.27 | $ 6.60 | $ 7.16
RSUs with Service Condition, weighted average grant date fair value based on share closing price |  |  |
RSUs With Service Condition |  |  |
Granted (in shares) | 2,485,124 | 452,585 | 160,025
Weighted Average Grant Date Fair Value |  |  |
Weighted average volatility estimated | 48.00% |  |
Expected term | 3 years |  |
Weighted average risk-free rate | 0.17% |  |
Share price (dollars per share) |  | $ 2.32 | $ 7.28
RSUs With Service Condition, Weighted Average Grant Date Fair Value Based on Share Closing Price |  |  |
RSUs With Service Condition |  |  |
Granted (in shares) | 1,224,507 | 44,922 |
Weighted Average Grant Date Fair Value |  |  |
Weighted average volatility estimated | 54.00% |  |
Expected term | 2 years 6 months |  |
Weighted average risk-free rate | 0.36% |  |
Share price (dollars per share) |  | $ 2.56 |
Remaining RSUs With Service Condition, Weighted Average Grant Date Fair Value Based on Share Closing Price |  |  |
RSUs With Service Condition |  |  |
Granted (in shares) | 215,958 |  |
Weighted Average Grant Date Fair Value |  |  |
Share price (dollars per share) | $ 4.70 |  |
RSUs with Service Condition and both Service and Market Conditions |  |  |
RSUs With Service Condition |  |  |
Granted (in shares) |  | 1,204,713 | 752,500
Weighted Average Grant Date Fair Value |  |  |
Weighted average volatility estimated |  | 14.00% | 15.00%
Expected term |  | 3 years | 3 years
Weighted average risk-free rate |  | 1.36% | 2.47%

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