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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Valuation Assumptions | The weighted-average estimated value of SPRs outstanding as of December 31, 2020 was $26.88 per SPR using the following assumptions:
Expected volatility | 46.5% to 66.9%
Risk-free rate of return | 0.1% to 0.2%
Expected term (in years) | 0.5 to 3.5
Expected annual dividend | $0
Activity Related to SPRs | Activity related to the Company’s SPRs during the year ended December 31, 2020 was as follows:
| Number of SPRs |  | Weighted Average Exercise Price
Outstanding on December 31, 2019 | 599,861 |  |  | $ | 26.56 |
Exercised | (18,861) |  |  | 16.48 |
Outstanding on December 31, 2020 | 581,000 |  |  | 26.88 |
Exercisable on December 31, 2020 | 573,086 |  |  | $ | 26.72 |
Activity Related to RSAs | Activity related to the Company’s RSAs during the year ended December 31, 2020 was as follows:
| Restricted Stock Awards
Outstanding on December 31, 2019 | 90,909 |
Granted | 18,371 |
Exchanged for common shares | (63,481) |
Outstanding on December 31, 2020 | 45,799 |
MSU Rollforward | Activity related to the Company’s MSUs during the year ended December 31, 2020 was as follows:
| Number of Market Stock Units |  | Maximum Shares Potentially Issuable
Outstanding on December 31, 2019 | 139,643 |  |  | 199,303 |
Granted | 21,648 |  |  | 32,472 |
Exchanged for stock | (24,035) |  |  | (36,052) |
Outstanding on December 31, 2020 | 137,256 |  |  | 195,723 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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