Stock Option Plans - Narrative (Details)	9 Months Ended
	Sep. 30, 2017 USD ($) compensation_plan shares	Sep. 29, 2017 $ / shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of stock option plans | compensation_plan	2
Option expiration period	10 years
Option vesting period	4 years
Closing share price (in usd per share) | $ / shares		$ 61.91
Granted (in shares) | shares	232,500
Intrinsic value of granted shares | $	$ 581,250
Weighted average remaining contractual life of the Company's outstanding options	7 years 7 months 29 days
Weighted average remaining contractual life of the Company's exercisable options	6 years 8 months