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Stockholders' Equity, Stock Option Activity (Details) - Stock Options [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Number of Shares [Abstract] |  |  |
Outstanding at beginning of period (in shares) | 11,311 |  |
Granted (in shares) | 2,543 |  |
Exercised (in shares) | (2,617) |  |
Cancelled/forfeited/expired (in shares) | (236) |  |
Outstanding at end of period (in shares) | 11,001 | 11,311 |
Exercisable at end of period (in shares) | 6,004 |  |
Weighted Average Exercise Price Per Share [Abstract] |  |  |
Outstanding at beginning of period (in dollars per share) | $ 47.85 |  |
Granted (in dollars per share) | 56.19 |  |
Exercised (in dollars per share) | 40.48 |  |
Cancelled/forfeited/expired (in dollars per share) | 50.11 |  |
Outstanding at end of period (in dollars per share) | 51.48 | $ 47.85 |
Exercisable at end of period (in dollars per share) | $ 50.95 |  |
Average Remaining Contractual Term, Aggregate Intrinsic Value and Other [Abstract] |  |  |
Average remaining contractual term, outstanding at end of period | 4 years 4 months 28 days |  |
Average remaining contractual term, exercisable at end of period | 3 years 4 months 2 days |  |
Aggregate intrinsic value, outstanding at end of period | $ 104,029 |  |
Aggregate intrinsic value, exercisable at end of period | $ 59,780 |  |
Weighted average fair value of options granted (in dollars per share) | $ 28.76 | $ 25.49 | $ 25.42
Intrinsic value of options exercised | $ 83,800 | $ 34,800 | $ 49,500
Cash received from exercise of stock options | $ 105,900 | $ 18,900 | $ 21,200
Weighted-average fair value of options exercised (in dollars per share) | $ 72.52 |  |
Unrecognized Compensation Expense [Abstract] |  |  |
Unrecognized compensation expense related to non-vested stock options | $ 97,500 |  |
Weighted average period for recognition | 1 year 3 months 18 days |  |

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- Definition The weighted average grant-date fair value of options exercised during the reporting period as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for option 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of cash inflow from exercise of option 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 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + 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=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 Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 + 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=116856206&loc=d3e5070-113901 + Details
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