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Stock Options, Restricted Stock and Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 6 Months Ended
--- | --- | ---
May 31, 2017 | Feb. 28, 2017 | Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Additional shares authorized for grants |  |  | 500,000
Maximum term of the awards granted under the Plan |  |  | 10 years
Stock-based compensation cost which has not yet been recognized |  |  | $ 20.9
Stock-based compensation cost recognized period, in months |  |  | 26 months
Restricted stock awarded subject to performance condition |  |  | 561,000
Restricted stock and restricted stock units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Grants, Number of shares or units | 7,541 | 67,599 | 75,140
Vesting period | 3 years | 4 years |
Share Price | $ 86.83 | $ 81.66 |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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