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Stock-Based Compensation - Stock Options by Exercise Price Range (Details) | 12 Months Ended
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Dec. 31, 2017 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding, Number Outstanding (in shares) | shares | 440,642
Options Outstanding, Weighted‑ Average Exercise Price (in USD per share) | $ 37.25
Options Exercisable, Number Outstanding (in shares) | shares | 127,891
Options Exercisable, Weighted‑ Average Exercise Price (in USD per share) | $ 39.91
$20.00-30.00 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding, Number Outstanding (in shares) | shares | 6,383
Options Outstanding, Weighted‑ Average Exercise Price (in USD per share) | $ 27.58
Options Outstanding, Weighted‑ Average Remaining Contractual Term (Years) | 1 year 3 months
Options Exercisable, Number Outstanding (in shares) | shares | 6,383
Options Exercisable, Weighted‑ Average Exercise Price (in USD per share) | $ 27.58
Options Exercisable, Weighted‑ Average Remaining Contractual Term (Years) | 1 year 3 months
30.01-40.00 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding, Number Outstanding (in shares) | shares | 360,895
Options Outstanding, Weighted‑ Average Exercise Price (in USD per share) | $ 33.19
Options Outstanding, Weighted‑ Average Remaining Contractual Term (Years) | 5 years 7 months
Options Exercisable, Number Outstanding (in shares) | shares | 85,957
Options Exercisable, Weighted‑ Average Exercise Price (in USD per share) | $ 33.19
Options Exercisable, Weighted‑ Average Remaining Contractual Term (Years) | 5 years 7 months
40.01-50.00 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding, Number Outstanding (in shares) | shares | 5,997
Options Outstanding, Weighted‑ Average Exercise Price (in USD per share) | $ 42.59
Options Outstanding, Weighted‑ Average Remaining Contractual Term (Years) | 4 years 9 months
Options Exercisable, Number Outstanding (in shares) | shares | 3,360
Options Exercisable, Weighted‑ Average Exercise Price (in USD per share) | $ 43.14
Options Exercisable, Weighted‑ Average Remaining Contractual Term (Years) | 3 years 11 months
50.01-60.00 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding, Number Outstanding (in shares) | shares | 50,428
Options Outstanding, Weighted‑ Average Exercise Price (in USD per share) | $ 55.86
Options Outstanding, Weighted‑ Average Remaining Contractual Term (Years) | 2 years 6 months
Options Exercisable, Number Outstanding (in shares) | shares | 23,407
Options Exercisable, Weighted‑ Average Exercise Price (in USD per share) | $ 56.12
Options Exercisable, Weighted‑ Average Remaining Contractual Term (Years) | 2 years 6 months
60.01-70.00 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding, Number Outstanding (in shares) | shares | 0
Options Outstanding, Weighted‑ Average Exercise Price (in USD per share) | $ 0.00
Options Outstanding, Weighted‑ Average Remaining Contractual Term (Years) | 0 years
Options Exercisable, Number Outstanding (in shares) | shares | 0
Options Exercisable, Weighted‑ Average Exercise Price (in USD per share) | $ 0.00
70.01-80.00 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding, Number Outstanding (in shares) | shares | 16,939
Options Outstanding, Weighted‑ Average Exercise Price (in USD per share) | $ 70.14
Options Outstanding, Weighted‑ Average Remaining Contractual Term (Years) | 2 years 1 month
Options Exercisable, Number Outstanding (in shares) | shares | 8,784
Options Exercisable, Weighted‑ Average Exercise Price (in USD per share) | $ 70.14
Options Exercisable, Weighted‑ Average Remaining Contractual Term (Years) | 2 years 1 month
Stock Option | $20.00-30.00 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of Exercise Prices, lower range limit (in USD per share) | $ 20.00
Range of Exercise Prices, upper range limit (in USD per share) | 30.00
Stock Option | 30.01-40.00 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of Exercise Prices, lower range limit (in USD per share) | 30.01
Range of Exercise Prices, upper range limit (in USD per share) | 40.00
Stock Option | 40.01-50.00 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of Exercise Prices, lower range limit (in USD per share) | 40.01
Range of Exercise Prices, upper range limit (in USD per share) | 50.00
Stock Option | 50.01-60.00 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of Exercise Prices, lower range limit (in USD per share) | 50.01
Range of Exercise Prices, upper range limit (in USD per share) | 60.00
Stock Option | 60.01-70.00 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of Exercise Prices, lower range limit (in USD per share) | 60.01
Range of Exercise Prices, upper range limit (in USD per share) | 70.00
Stock Option | 70.01-80.00 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of Exercise Prices, lower range limit (in USD per share) | 70.01
Range of Exercise Prices, upper range limit (in USD per share) | $ 80.00

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The ceiling 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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