Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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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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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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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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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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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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Equity-Based Compensation (Details 3) - USD ($)	3 Months Ended		6 Months Ended
Equity-Based Compensation (Details 3) - USD ($)	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Equity-based compensation
Cash received related to exercise of stock options			$ 2,013,000
Excess tax benefit realized on exercise of stock options			$ 2,361,000
Additional shares available to grant under plan (in shares)	1,928,282		1,928,282
Restricted Stock Units (RSUs)
Equity-based compensation
Excess tax benefit realized on exercise of stock options			$ 2,361,000
Restricted Stock Units, Unvested	119,564		119,564
Equity-based compensation (in dollars)	$ 526,000	$ 74,000	$ 668,000	$ 332,000
President Emeritus [Member] \| Restricted Stock Units (RSUs)
Equity-based compensation
Restricted Stock Units, Unvested	7,576		7,576
Equity-based compensation (in dollars)			$ 107,000