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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Net number of non-option equity instruments granted to participants.

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

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Number of share instruments newly issued under a share-based compensation plan.

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Stock and Stock Options - Additional Information (Details) - USD ($) $ in Millions		1 Months Ended	6 Months Ended
	Mar. 23, 2015	Mar. 31, 2015	Jun. 30, 2015	Jun. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options and stock option plans vesting terms period			3 years
Stock option issued			156,000
General and Administrative Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense			$ 2.0	$ 1.7
Other Stock-Based Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards issued under the employee stock and incentive plan	12,000
Restricted Stock Unit Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock units awards issued	38,000
Stock options and stock option plans vesting terms period	3 years
Restricted Stock Unit Awards \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option issued		86,500
Performance Shares \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option issued		280,000