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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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-Publisher FASB

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-Name Staff Accounting Bulletin (SAB)

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

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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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Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

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- Definition

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 number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Employee Benefit Plans (Details 3) (USD $)	12 Months Ended
Employee Benefit Plans (Details 3) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Benefit Plans
Compensation cost	$ 4,200,000	$ 2,200,000	$ 2,000,000
Restricted stock
Employee Benefit Plans
Compensation cost	84,000
Unrecognized compensation cost	265,000
Period for recognition	3 years
Shares
Unvested restricted stock, beginning balance (in shares)	650,002
Granted (in shares)	40,000
Vested (in shares)	(216,666)
Unvested restricted stock, end balance (in shares)	473,336
Aggregate Intrinsic Value
Unvested restricted stock aggregate intrinsic value	$ 1,420,008
Restricted stock \| Minimum
Employee Benefit Plans
Vesting period	1 year
Restricted stock \| Maximum
Employee Benefit Plans
Vesting period	3 years