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Stock-Based Compensation - Significant Option Groups Outstanding and Related Weighted Average Exercise Price and Life Information (Details) - $ / shares shares in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Options Outstanding |  |  |  |
Number outstanding (in shares) | 745 | 597 | 520 | 652
Weighted-average remaining contractual term (in years) | 3 years 11 months 19 days | 4 years 29 days | 4 years 3 months |
Weighted average exercise price (in dollars per share) | $ 41.73 | $ 44.27 | $ 42.56 | $ 39.27
Options Exercisable |  |  |  |
Number exercisable (in shares) | 517 | 430 | 381 |
Weighted-average exercise price (in dollars per share) | $ 44.95 | $ 42.30 | $ 36.39 |
$19.25 to $27.07 |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |
Range of exercise prices, lower range limit (in dollars per share) | 19.25 |  |  |
Range of exercise prices, upper range limit (in dollars per share) | $ 27.07 |  |  |
Options Outstanding |  |  |  |
Number outstanding (in shares) | 263 |  |  |
Weighted-average remaining contractual term (in years) | 4 years 8 months 19 days |  |  |
Weighted average exercise price (in dollars per share) | $ 23.83 |  |  |
Options Exercisable |  |  |  |
Number exercisable (in shares) | 112 |  |  |
Weighted-average exercise price (in dollars per share) | $ 19.49 |  |  |
$35.28 to $44.95 |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |
Range of exercise prices, lower range limit (in dollars per share) | 35.28 |  |  |
Range of exercise prices, upper range limit (in dollars per share) | $ 44.95 |  |  |
Options Outstanding |  |  |  |
Number outstanding (in shares) | 200 |  |  |
Weighted-average remaining contractual term (in years) | 3 years 6 months |  |  |
Weighted average exercise price (in dollars per share) | $ 41.04 |  |  |
Options Exercisable |  |  |  |
Number exercisable (in shares) | 150 |  |  |
Weighted-average exercise price (in dollars per share) | $ 39.75 |  |  |
$51.38 to $65.54 |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |  |
Range of exercise prices, lower range limit (in dollars per share) | 51.38 |  |  |
Range of exercise prices, upper range limit (in dollars per share) | $ 65.54 |  |  |
Options Outstanding |  |  |  |
Number outstanding (in shares) | 282 |  |  |
Weighted-average remaining contractual term (in years) | 3 years 7 months 13 days |  |  |
Weighted average exercise price (in dollars per share) | $ 58.85 |  |  |
Options Exercisable |  |  |  |
Number exercisable (in shares) | 255 |  |  |
Weighted-average exercise price (in dollars per share) | $ 59.21 |  |  |

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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=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable 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)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&loc=d3e5070-113901 + Details
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