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Share-based Compensation and Equity - Summary of Stock Option Plans, by Exercise Price Range (Details) - $ / shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices | $ 17.85 | $ 18.18 | $ 18.79 | $ 19.30
Options Outstanding, Number of Shares (in shares) | 3,428,000 | 5,388,000 | 9,020,000 | 9,903,000
Options Exercisable, Number of Shares (in shares) | 3,292,000 | 4,846,000 | 7,878,000 |
Stock options, net of estimated forfeitures |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expected dividend yield | 0.00% | 0.00% | 0.00% |
$13.97 - $15.55 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Number of Shares (in shares) | 748,000 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) | 6 years 10 months 2 days |  |  |
Options Exercisable, Number of Shares (in shares) | 625,000 |  |  |
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) | 6 years 6 months 29 days |  |  |
Risk-Free Interest Rate, Minimum | 1.99% |  |  |
Risk-Free Interest Rate, Maximum | 3.05% |  |  |
Expected Volatility, Minimum | 38.29% |  |  |
Expected Volatility, Maximum | 64.18% |  |  |
$13.97 - $15.55 | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices | $ 13.97 |  |  |
Expected Terms in Years | 3 years 3 months |  |  |
$13.97 - $15.55 | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices | $ 15.55 |  |  |
Expected Terms in Years | 5 years 10 months 28 days |  |  |
$16.38 - $17.89 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Number of Shares (in shares) | 2,247,000 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) | 2 years 8 months 19 days |  |  |
Options Exercisable, Number of Shares (in shares) | 2,235,000 |  |  |
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) | 2 years 8 months 4 days |  |  |
Risk-Free Interest Rate, Minimum | 1.38% |  |  |
Risk-Free Interest Rate, Maximum | 2.34% |  |  |
Expected Volatility, Minimum | 35.20% |  |  |
Expected Volatility, Maximum | 58.84% |  |  |
$16.38 - $17.89 | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices |  | $ 16.38 |  |
Expected Terms in Years | 3 years 2 months 12 days |  |  |
$16.38 - $17.89 | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices |  | $ 17.89 |  |
Expected Terms in Years | 7 years 1 month 13 days |  |  |
$21.00 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices | $ 21.00 |  |  |
Options Outstanding, Number of Shares (in shares) | 146,000 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) | 8 months 12 days |  |  |
Options Exercisable, Number of Shares (in shares) | 146,000 |  |  |
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) | 8 months 12 days |  |  |
Risk Free Interest Rate | 1.81% |  |  |
Expected Terms in Years | 4 years |  |  |
Expected Volatility | 57.79% |  |  |
$22.88 - $31.92 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Number of Shares (in shares) | 287,000 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) | 9 months 3 days |  |  |
Options Exercisable, Number of Shares (in shares) | 287,000 |  |  |
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) | 9 months 3 days |  |  |
Risk-Free Interest Rate, Minimum | 0.73% |  |  |
Risk-Free Interest Rate, Maximum | 2.86% |  |  |
Expected Volatility, Minimum | 39.03% |  |  |
Expected Volatility, Maximum | 53.80% |  |  |
$22.88 - $31.92 | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices | $ 22.88 |  |  |
Expected Terms in Years | 4 years |  |  |
$22.88 - $31.92 | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices | $ 31.92 |  |  |
Expected Terms in Years | 6 years 6 months 7 days |  |  |
$13.97 - $15.55 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Number of Shares (in shares) |  | 944,000 | 674,000 |
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) |  | 7 years 10 months 20 days | 8 years 3 months 21 days |
Options Exercisable, Number of Shares (in shares) |  | 524,000 | 250,000 |
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) |  | 7 years 21 days | 7 years 11 months 23 days |
Risk-Free Interest Rate, Minimum |  | 1.81% | 1.81% |
Risk-Free Interest Rate, Maximum |  | 3.05% | 3.05% |
Expected Volatility, Minimum |  | 38.29% | 49.98% |
Expected Volatility, Maximum |  | 64.18% | 64.18% |
$13.97 - $15.55 | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices |  | $ 13.97 | $ 13.97 |
Expected Terms in Years |  | 3 years 3 months | 3 years 3 months |
$13.97 - $15.55 | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices |  | $ 15.55 | $ 15.55 |
Expected Terms in Years |  | 5 years 10 months 28 days | 5 years 10 months 28 days |
$17.00 - $19.56 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Number of Shares (in shares) |  | 3,597,000 | 5,730,000 |
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) |  | 3 years 1 month 13 days | 3 years 8 months 8 days |
Options Exercisable, Number of Shares (in shares) |  | 3,475,000 | 5,013,000 |
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) |  | 2 years 11 months 12 days | 3 years 6 months |
Risk-Free Interest Rate, Minimum |  | 1.38% | 0.49% |
Risk-Free Interest Rate, Maximum |  | 2.94% | 2.94% |
Expected Volatility, Minimum |  | 35.20% | 36.04% |
Expected Volatility, Maximum |  | 58.84% | 69.74% |
$17.00 - $19.56 | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices |  | $ 17.00 | $ 17.00 |
Expected Terms in Years |  | 2 years 7 months 6 days | 2 years 7 months 6 days |
$17.00 - $19.56 | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices |  | $ 19.56 | $ 19.56 |
Expected Terms in Years |  | 10 years | 10 years |
$21.00 - $21.52 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Number of Shares (in shares) |  | 330,000 | 1,917,000 |
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) |  | 1 year 1 month 2 days | 1 year 4 months 20 days |
Options Exercisable, Number of Shares (in shares) |  | 330,000 | 1,916,000 |
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) |  | 1 year 1 month 2 days | 1 year 4 months 20 days |
Risk-Free Interest Rate, Minimum |  | 0.68% | 0.68% |
Risk-Free Interest Rate, Maximum |  | 2.61% | 2.60% |
Expected Volatility, Minimum |  | 38.16% | 38.16% |
Expected Volatility, Maximum |  | 57.79% | 69.74% |
$21.00 - $21.52 | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices |  | $ 21.00 | $ 21.00 |
Expected Terms in Years |  | 3 years 9 months 14 days | 2 years 11 months 1 day |
$21.00 - $21.52 | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices |  | $ 21.52 | $ 21.52 |
Expected Terms in Years |  | 6 years 6 months 18 days | 6 years 6 months 7 days |
$22.32 - $31.92 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Number of Shares (in shares) |  | 517,000 | 699,000 |
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) |  | 1 year 5 months 8 days | 2 years 6 months 10 days |
Options Exercisable, Number of Shares (in shares) |  | 517,000 | 699,000 |
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) |  | 1 year 5 months 8 days | 2 years 6 months 10 days |
Risk-Free Interest Rate, Minimum |  | 0.60% | 0.60% |
Risk-Free Interest Rate, Maximum |  | 3.03% | 2.93% |
Expected Volatility, Minimum |  | 36.93% | 36.93% |
Expected Volatility, Maximum |  | 53.80% | 53.80% |
$22.32 - $31.92 | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices |  | $ 22.32 | $ 22.32 |
Expected Terms in Years |  | 3 years 2 months 4 days | 4 years |
$22.32 - $31.92 | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices |  | $ 31.92 | $ 31.92 |
Expected Terms in Years |  | 6 years 6 months 7 days | 6 years 6 months 7 days |

X
- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 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 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)(ii) -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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- Definition The estimated measure of the minimum 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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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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)(iv) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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