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Stock-Based Compensation Plans - Stock Performance Rights (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Valuation assumptions: |  |
Cash paid out for SPR excercises | $ 500,000 | $ 13,400,000
Liability reflecting estimated fair value of future pay-outs | $ 14,437,000 | 14,908,000
Stock Performance Rights |  |
Stock Performance Rights |  |
Weighted average estimated value of SPRs outstanding (in USD per share) | $ 26.88 |
Valuation assumptions: |  |
Expected volatility, minimum, percent | 46.50% |
Expected volatility, maximum, percent | 66.90% |
Risk-free rate of return, minimum | 0.10% |
Risk-free rate of return, maximum | 0.20% |
Expected annual dividend | $ 0 |
Stock options expense |  | $ 14,900,000
Liability reflecting estimated fair value of future pay-outs | $ 14,400,000 |
Number of SPRs |  |
Outstanding on December 31, 2019 (in shares) | 599,861 |
Exercised (in shares) | (18,861) |
Outstanding on December 31, 2020 (in shares) | 581,000 | 599,861
Exercisable on December 31, 2020 (in shares) | 573,086 |
Weighted Average Exercise Price |  |
Outstanding on December 31, 2019 (in USD per share) | $ 26.88 | $ 26.56
Exercised (in USD per share) |  | 16.48
Outstanding on December 31, 2020 (in USD per share) |  | 26.88
Exercisable on December 31, 2020 (in USD per share) |  | $ 26.72
SPRs outstanding, intrinsic value | $ 14,600,000 |
Total unrecognized compensation cost | $ 200,000 |
Unrecognized cost, period for recognition (in years) | 1 year |
Shares vested (in shares) | 43,397 |
Vested in period, fair value | $ 1,300,000 |
Weighted average remaining contractual term, SPRs outstanding (in years) | 2 years |
Weighted average remaining contractual term, SPRs exercisable (in years) | 1.8 years |
Stock Performance Rights | Minimum |  |
Stock Performance Rights |  |
Expiration period (in years) | 7 years |
Award vesting period (in years) | 1 year |
Valuation assumptions: |  |
Expected term (in years) | 6 months |
Stock Performance Rights | Maximum |  |
Stock Performance Rights |  |
Award vesting period (in years) | 3 years |
Valuation assumptions: |  |
Expected term (in years) | 3 years 6 months |

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- Definition Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6935-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6911-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cash paid to settle liability for award under share-based payment arrangement. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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