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Stock Option Summary (Details) - Employee Stock Option [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
[Line Items] |  |  |  |
Outstanding, beginning balance, Number | 956 | 959 | 959 |
Outstanding, beginning balance, Weighted Average Exercise Price Per Share | $ 47.10 | $ 45.64 | $ 45.64 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term | 6 years 6 months | 6 years 8 months 12 days | 6 years 3 months 18 days | 6 years 7 months 6 days
Outstanding, beginning balance, Aggregate Intrinsic Value | $ 21,965 | $ 19,125 | $ 19,125 |
Shares converted upon acquisition, number | 42 |  |  |
Shares converted upon acquisition, Weighted Average Exercise Price | $ 51.86 |  |  |
Shares converted upon acquisition, Weighted Average Grant Date Fair Value | $ 14.86 |  |  |
Options granted, number | 101 | 121 |  |
Granted, Weighted Average Exercise Price Per Share | $ 69.30 | $ 65.55 |  |
Granted, Weighted Average Grant Date Fair Value | $ 24.83 | $ 22.01 |  |
Exercised, Number | (62) | (5) |  |
Exercised, Weighted Average Exercise Price Per Share | $ 40.31 | $ 35.29 |  |
Exercised, Aggregate Intrinsic Value | $ 2,104 | $ 120 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares | (3) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value | $ 72.25 |  |  |
Expired, Number | (7) |  |  |
Expired, Weighted Average Exercise Price Per Share | $ 95.96 |  |  |
Outstanding, ending balance, Number | 1,027 | 1,075 | 956 | 959
Outstanding, ending balance, Weighted Average Exercise Price Per Share | $ 49.49 | $ 47.92 | $ 47.10 | $ 45.64
Outstanding, ending balance, Aggregate Intrinsic Value | $ 24,051 | $ 17,236 | $ 21,965 | $ 19,125
Exercisable, Number | 716 |  |  |
Exercisable, Weighted Average Exercise Price Per Share | $ 45.96 |  |  |
Exercisable, Weighted Average Remaining Contractual Term | 5 years 6 months |  |  |
Exercisable, Aggregate Intrinsic Value | $ 19,725 |  |  |
Expected to Vest [Member] |  |  |  |
[Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term | 8 years 10 months 24 days |  |  |
Outstanding, ending balance, Number | 308 |  |  |
Outstanding, ending balance, Weighted Average Exercise Price Per Share | $ 57.74 |  |  |
Outstanding, ending balance, Aggregate Intrinsic Value | $ 4,255 |  |  |

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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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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