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Share-based Compensation - Summary of Stock Option Plans, by Exercise Price Range (Details) - $ / shares shares in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices | $ 19.30 | $ 21.81 | $ 26.12 | $ 25.84
Options Outstanding, Number of Shares (in shares) | 9,903 | 10,928 | 11,427 | 10,919
Options Exercisable, Number of Shares (in shares) | 8,606 | 9,004 | 8,293 |
$14.58 - $19.56 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Number of Shares (in shares) | 6,500 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) | 4 years 6 months 29 days |  |  |
Options Exercisable, Number of Shares (in shares) | 5,549 |  |  |
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) | 4 years 2 months 19 days |  |  |
Risk-Free Interest Rate, Minimum | 0.33% |  |  |
Risk-Free Interest Rate, Maximum | 3.31% |  |  |
Expected Volatility, Minimum | 32.18% |  |  |
Expected Volatility, Maximum | 69.74% |  |  |
$14.58 - $19.56 | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices | $ 14.58 |  |  |
Expected Terms in Years | 2 years 11 days |  |  |
$14.58 - $19.56 | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices | $ 19.56 |  |  |
Expected Terms in Years | 10 years |  |  |
$18.36 - $19.56 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Number of Shares (in shares) |  | 3,601 | 3,790 |
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) |  | 9 months 18 days | 1 year 9 months 18 days |
Options Exercisable, Number of Shares (in shares) |  | 3,601 | 3,790 |
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) |  | 9 months 18 days | 1 year 9 months 18 days |
Risk-Free Interest Rate, Minimum |  | 0.32% | 0.32% |
Risk-Free Interest Rate, Maximum |  | 4.20% | 4.20% |
Expected Volatility, Minimum |  | 26.85% | 26.85% |
Expected Volatility, Maximum |  | 52.47% | 52.47% |
$18.36 - $19.56 | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices |  | $ 18.36 | $ 18.36 |
Expected Terms in Years |  | 1 year 10 months 24 days | 1 year 10 months 24 days |
$18.36 - $19.56 | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices |  | $ 19.56 | $ 19.56 |
Expected Terms in Years |  | 6 years 11 months 12 days | 6 years 11 months 12 days |
$21.00 - $21.28 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Number of Shares (in shares) | 693 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) | 2 years 2 months 5 days |  |  |
Options Exercisable, Number of Shares (in shares) | 347 |  |  |
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) | 7 months 28 days |  |  |
Risk-Free Interest Rate, Minimum | 0.43% |  |  |
Risk-Free Interest Rate, Maximum | 3.60% |  |  |
Expected Volatility, Minimum | 33.24% |  |  |
Expected Volatility, Maximum | 57.79% |  |  |
$21.00 - $21.28 | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices | $ 21.00 |  |  |
Expected Terms in Years | 2 years 1 month 9 days |  |  |
$21.00 - $21.28 | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices | $ 21.28 |  |  |
Expected Terms in Years | 6 years 8 months 1 day |  |  |
$20.16 - $21.28 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Number of Shares (in shares) |  | 353 | 353 |
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) |  | 1 year 7 months 28 days | 2 years 8 months 12 days |
Options Exercisable, Number of Shares (in shares) |  | 353 | 353 |
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) |  | 1 year 7 months 28 days | 2 years 8 months 12 days |
Risk-Free Interest Rate, Minimum |  | 0.42% | 0.42% |
Risk-Free Interest Rate, Maximum |  | 3.60% | 3.60% |
Expected Volatility, Minimum |  | 33.24% | 33.24% |
Expected Volatility, Maximum |  | 52.47% | 52.47% |
$20.16 - $21.28 | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices |  | $ 20.16 | $ 20.16 |
Expected Terms in Years |  | 2 years 1 month 9 days | 2 years 1 month 9 days |
$20.16 - $21.28 | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices |  | $ 21.28 | $ 21.28 |
Expected Terms in Years |  | 6 years 6 months 7 days | 6 years 6 months 7 days |
$21.32 - $21.52 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Number of Shares (in shares) | 1,776 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) | 2 years 1 month 21 days |  |  |
Options Exercisable, Number of Shares (in shares) | 1,776 |  |  |
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) | 2 years 1 month 21 days |  |  |
Risk-Free Interest Rate, Minimum | 0.68% |  |  |
Risk-Free Interest Rate, Maximum | 2.61% |  |  |
Expected Volatility, Minimum | 38.16% |  |  |
Expected Volatility, Maximum | 69.74% |  |  |
$21.32 - $21.52 | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices | $ 21.32 |  |  |
Expected Terms in Years | 3 years 4 months 17 days |  |  |
$21.32 - $21.52 | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices | $ 21.52 |  |  |
Expected Terms in Years | 6 years 6 months 18 days |  |  |
$21.48 - $21.52 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Number of Shares (in shares) |  | 438 | 516 |
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) |  | 3 years 9 months 22 days | 4 years 9 months 18 days |
Options Exercisable, Number of Shares (in shares) |  | 438 | 512 |
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) |  | 3 years 9 months 22 days | 4 years 9 months 18 days |
Risk-Free Interest Rate, Minimum |  | 0.68% | 0.68% |
Risk-Free Interest Rate, Maximum |  | 2.63% | 2.63% |
Expected Volatility, Minimum |  | 38.16% | 38.16% |
Expected Volatility, Maximum |  | 52.47% | 52.47% |
$21.48 - $21.52 | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices |  | $ 21.48 | $ 21.48 |
Expected Terms in Years |  | 3 years 4 months 17 days | 3 years 4 months 17 days |
$21.48 - $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 29 days | 6 years 6 months 29 days |
$21.68 - $22.32 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Number of Shares (in shares) | 221 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) | 1 year 11 months 9 days |  |  |
Options Exercisable, Number of Shares (in shares) | 221 |  |  |
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) | 1 year 11 months 9 days |  |  |
Risk-Free Interest Rate, Minimum | 0.57% |  |  |
Risk-Free Interest Rate, Maximum | 3.03% |  |  |
Expected Volatility, Minimum | 36.78% |  |  |
Expected Volatility, Maximum | 52.47% |  |  |
$21.68 - $22.32 | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices | $ 21.68 |  |  |
Expected Terms in Years | 2 years 2 months 4 days |  |  |
$21.68 - $22.32 | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices | $ 22.32 |  |  |
Expected Terms in Years | 6 years 6 months 7 days |  |  |
$21.68 - $22.32 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Number of Shares (in shares) |  | 320 | 344 |
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) |  | 3 years 1 month 6 days | 4 years 1 month 6 days |
Options Exercisable, Number of Shares (in shares) |  | 320 | 344 |
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) |  | 3 years 1 month 6 days | 4 years 1 month 6 days |
Risk-Free Interest Rate, Minimum |  | 0.57% | 0.57% |
Risk-Free Interest Rate, Maximum |  | 3.03% | 3.03% |
Expected Volatility, Minimum |  | 36.78% | 36.78% |
Expected Volatility, Maximum |  | 52.47% | 52.47% |
$21.68 - $22.32 | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices |  | $ 21.68 | $ 21.68 |
Expected Terms in Years |  | 2 years 2 months 4 days | 2 years 2 months 4 days |
$21.68 - $22.32 | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices |  | $ 22.32 | $ 22.32 |
Expected Terms in Years |  | 6 years 6 months 7 days | 6 years 6 months 7 days |
$22.88 - $31.92 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Number of Shares (in shares) | 713 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) | 3 years 9 months 4 days |  |  |
Options Exercisable, Number of Shares (in shares) | 713 |  |  |
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) | 3 years 9 months 4 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 |  |  |
$22.40 - $31.92 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Number of Shares (in shares) |  | 6,216 | 2,634 |
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) |  | 7 years 26 days | 8 years 2 months 12 days |
Options Exercisable, Number of Shares (in shares) |  | 4,291 | 1,108 |
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) |  | 6 years 8 months 16 days | 7 years 1 month 21 days |
Risk-Free Interest Rate, Minimum |  | 0.73% | 0.73% |
Risk-Free Interest Rate, Maximum |  | 2.86% | 2.86% |
Expected Volatility, Minimum |  | 39.03% | 39.03% |
Expected Volatility, Maximum |  | 58.84% | 58.84% |
$22.40 - $31.92 | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices |  | $ 22.40 | $ 22.40 |
Expected Terms in Years |  | 4 years | 4 years |
$22.40 - $31.92 | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices |  | $ 31.92 | $ 31.92 |
Expected Terms in Years |  | 7 years 1 month 13 days | 6 years 6 months 7 days |
34.52 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise Prices |  |  | $ 34.52 |
Options Outstanding, Number of Shares (in shares) |  |  | 3,788 |
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) |  |  | 7 years 9 months 18 days |
Options Exercisable, Number of Shares (in shares) |  |  | 2,184 |
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) |  |  | 7 years 9 months 18 days |
Risk-Free Interest Rate, Minimum |  |  | 1.76% |
Risk-Free Interest Rate, Maximum |  |  | 2.07% |
Expected Volatility, Minimum |  |  | 51.51% |
Expected Volatility, Maximum |  |  | 53.51% |
34.52 | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expected Terms in Years |  |  | 6 years 7 days |
34.52 | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expected Terms in Years |  |  | 7 years 1 month 13 days |
Employee Time Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expected dividend yield | 0.00% | 0.00% | 0.00% |

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- 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=109197908&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 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock 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)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, 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 (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, 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=109197908&loc=d3e5070-113901 + Details
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