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Stock-Based Compensation Plans (Details 2) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Stock Options |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Intrinsic value of options exercised | $ 3,016 | $ 3,592 | $ 9,187
2009 Plan |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Options outstanding intrinsic value | 5,616 |  |
Options exercisable intrinsic value | $ 5,525 |  |
Options exercisable weighted average contractual life (in years) | 4 years |  |
2009 Plan | Stock Options |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Number of Options (in shares) | 124,212 |  |
70.00 - 79.99 | 2009 Plan | Stock Options |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Number of Options (in shares) | 4,380 |  |
Exercise Price, lower limit (in dollars per share) | $ 70.00 |  |
Exercise Price, upper limit (in dollars per share) | $ 79.99 |  |
Weighted Average Remaining Contractual Term | 1 year 1 month 6 days |  |
110.00 - 119.99 | 2009 Plan | Stock Options |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Number of Options (in shares) | 7,865 |  |
Exercise Price, lower limit (in dollars per share) | $ 110.00 |  |
Exercise Price, upper limit (in dollars per share) | $ 119.99 |  |
Weighted Average Remaining Contractual Term | 2 years 1 month 6 days |  |
120.00 - 129.99 | 2009 Plan | Stock Options |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Number of Options (in shares) | 29,862 |  |
Exercise Price, lower limit (in dollars per share) | $ 120.00 |  |
Exercise Price, upper limit (in dollars per share) | $ 129.99 |  |
Weighted Average Remaining Contractual Term | 4 years 2 months 12 days |  |
130.00 - 139.99 | 2009 Plan | Stock Options |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Number of Options (in shares) | 75,110 |  |
Exercise Price, lower limit (in dollars per share) | $ 130.00 |  |
Exercise Price, upper limit (in dollars per share) | $ 139.99 |  |
Weighted Average Remaining Contractual Term | 3 years 9 months 18 days |  |
160.00 - 169.00 | 2009 Plan | Stock Options |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Number of Options (in shares) | 6,995 |  |
Exercise Price, lower limit (in dollars per share) | $ 160.00 |  |
Exercise Price, upper limit (in dollars per share) | $ 169.99 |  |
Weighted Average Remaining Contractual Term | 9 years 1 month 6 days |  |

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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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)(2) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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