(Textual) (Details) $ / shares in Units, $ in Millions	3 Months Ended
Mar. 31, 2016 USD ($) $ / shares shares	Apr. 20, 2015 shares
Share-Based Compensation Plans (Textual) [Abstract]
Share-based compensation expense \| $	$ 0.8
Corporation granted shares of common stock \| shares	940
Common stock available for future grants under share-based compensation plans \| shares		1,300,000
Stock Option Vesting Period, Post 2012 Grants	5 years
Stock Option Vesting Period Pre 2013 Grants	3 years
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Plans (Textual) [Abstract]
Corporation granted options to purchase restricted stock performance units \| shares	98,425
Unrecognized compensation expense \| $	$ 5.6
Unrecognized compensation expense, period for recognition	2 years 10 months 24 days
Restricted Stock Units (RSUs) [Member] \| Maximum [Member]
Share-Based Compensation Plans (Textual) [Abstract]
Restricted stock performance units eligible to vest as a multiple of number of units granted	1.5
Restricted Stock Units (RSUs) [Member] \| Minimum [Member]
Share-Based Compensation Plans (Textual) [Abstract]
Restricted stock performance units eligible to vest as a multiple of number of units granted	0.5
Equity Option [Member]
Share-Based Compensation Plans (Textual) [Abstract]
Common stock available for future grants under share-based compensation plans \| shares	704,273
Weighted-average remaining contractual terms for outstanding stock options	7 years 4 months 24 days
Weighted-average remaining contractual terms for exercisable stock options	5 years 1 month 6 days
Outstanding in-the-money stock options, intrinsic value \| $	$ 11.0
Exercisable in-the-money stock options, intrinsic value \| $	$ 7.3
Closing price of common stock \| $ / shares	$ 35.69
Unrecognized compensation expense \| $	$ 5.7
Unrecognized compensation expense, period for recognition	4 years
Employee Stock Option [Member]
Share-Based Compensation Plans (Textual) [Abstract]
Stock Option Award Vesting Period	10 years
Vested & Nonvested [Member] \| Employee Stock Option [Member]
Share-Based Compensation Plans (Textual) [Abstract]
Corporation granted options to purchase common stock \| shares	441,167

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate number of common shares reserved for future issuance.

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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.

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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).

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Net number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders.

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