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Stock-Based Compensation Restricted Stock Units Summary (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
[Line Items] |  |  |  |  |
Outstanding, beginning balance (in shares) |  |  |  | 684 | 817
Outstanding, beginning balance, weighted average grant date fair value (in dollars per share) |  |  |  | $ 64.38 |
Granted (in shares) |  |  |  | 209 | 334
Granted, weighted average grant date fair value (in dollars per share) |  |  |  | $ 83.34 | $ 62.04
Forfeited (in shares) |  |  |  | (23) | (53)
Forfeited, weighted average grant date fair value (in dollars per share) |  |  |  | $ 69.12 |
Outstanding, ending balance (in shares) |  | 532 | 663 | 532 | 663
Outstanding, ending balance, weighted average grant date fair value (in dollars per share) |  | $ 71.45 |  | $ 71.45 |
Vested and Released [Member] |  |  |  |  |
[Line Items] |  |  |  |  |
Released (in shares) | [1] |  |  | (338) | (435)
Released, weighted average grant date fair value (in dollars per share) |  |  |  | $ 65.01 |
Released, aggregate intrinsic value |  |  |  | $ 21,947 | $ 26,852
Vested but Not Released [Member] |  |  |  |  |
[Line Items] |  |  |  |  |
Released (in shares) |  |  |  | (9) |
Released, aggregate intrinsic value |  |  |  | $ 549 |
Long Term Performance Restricted Stock Award [Member] |  |  |  |  |
[Line Items] |  |  |  |  |
Granted, weighted average grant date fair value (in dollars per share) |  | $ 61.45 | $ 72.18 | $ 93.05 | $ 61.25
[1] | (1) Shares released is presented gross of shares netted for employee payroll tax obligations.

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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit 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 -Subparagraph (c)(2)(i)-(ii) -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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