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Percentage of FMV common stock options granted.

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Transferred

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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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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Unrecognized cost of unvested share-based compensation awards.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The highest quantity of shares an employee can purchase under the plan per period.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross 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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Number of options outstanding, including both vested and non-vested options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Stock-Based Compensation (Details Textual) - USD ($) $ in Millions			1 Months Ended	12 Months Ended
	May 25, 2016	Apr. 12, 2010	Dec. 30, 2013	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	May 29, 2010
Stock Based Compensation Details [Line Items]
Shares of common stock outstanding				53,148,441	53,000,689
Intrinsic value of options outstanding				$ 11.5	$ 17.4	$ 17.1
Intrinsic value of options exercisable				11.3	16.3	12.7
Intrinsic value of options exercised				0.3	0.6	3.4
Unrecognized compensation costs				3.4
General and Administrative Expense
Stock Based Compensation Details [Line Items]
Stock option based expenses				$ 2.3	$ 1.7	$ 0.3
Director Stock Option Plan - 1999
Stock Based Compensation Details [Line Items]
Shares approved and authorized (in shares)				1,975,000
Number of Options Granted (in shares)				2,634,798
Number of Options Forfeited (in shares)				807,782
Number of Options Outstanding (in shares)				650,000
Shares available for grant				147,984
Maximum term				10 years
Vesting period				1 year
Nineteen Ninety Nine Stock Incentive Plan
Stock Based Compensation Details [Line Items]
Shares approved and authorized (in shares)				3,200,000
Number of Options Granted (in shares)				2,892,500
Maximum term				10 years
Vesting period				4 years
Percent of FMV options granted				100.00%
Service period				1 year
Plan 2009
Stock Based Compensation Details [Line Items]
Shares approved and authorized (in shares)								5,000,000
Number of Options Outstanding (in shares)				3,216,369
Additional shares authorized (in shares)		2,000,000
Maximum number of shares to any individual (in shares)				1,000,000
Shares of common stock outstanding				1,341,746
Options transferred				92,883
Plan 2016
Stock Based Compensation Details [Line Items]
Shares approved and authorized (in shares)	2,000,000
Shares available for grant				1,981,867
Maximum number of shares to any individual (in shares)	1,000,000
Shares of common stock outstanding				20,000
Plan 2016, Plan 2009 And Director Plan
Stock Based Compensation Details [Line Items]
Number of Options Outstanding (in shares)				4,105,369
Jason Grenfell-Gardner
Stock Based Compensation Details [Line Items]
Shares granted (in shares)			325,000
Restricted Stock Units (RSUs)
Stock Based Compensation Details [Line Items]
RSUs outstanding				179,900	182,750	0
Shares granted (in shares)				58,068	230,250
Restricted Stock Units (RSUs) \| Plan 2009
Stock Based Compensation Details [Line Items]
RSUs outstanding				179,900
Restricted Stock
Stock Based Compensation Details [Line Items]
RSUs outstanding					0	108,334	246,001
Stock option based expenses				$ 0.8	$ 0.6	$ 0.5
Unrecognized compensation costs				$ 1.0
Shares granted (in shares)					32,500	0
Common Stock \| Plan 2016
Stock Based Compensation Details [Line Items]
Number of Options Outstanding (in shares)				239,000
Minimum \| Restricted Stock
Stock Based Compensation Details [Line Items]
Vesting period				1 year
Maximum \| Restricted Stock
Stock Based Compensation Details [Line Items]
Vesting period				3 years