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Stock Option Plans - Narrative (Details) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2015 compensation_plan $ / shares shares | Dec. 31, 2007 shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |
Number of stock incentive plans | compensation_plan | 2 |
Option expiration period | 10 years |
Option vesting period | 4 years |
Closing share price (in usd per share) | $ 51.75 |
Options granted (in shares) | shares | 225,000 | 73,403
Weighted average remaining contractual life of the Company's outstanding options | 7 years 2 months 28 days |
Weighted average remaining contractual life of the Company's exercisable options | 5 years 11 months 1 day |

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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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