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Defined Contribution Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Contribution Plan [Abstract]
Required time period for employees for profit sharing plan	3 months
Maximum employer contribution as a percentage of employee contribution	50.00%
Contribution expense recognized	$ 0	$ 0	$ 0
Employer matching contribution amount	$ 900,000	$ 700,000	$ 500,000

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

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No definition available.

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

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- Definition

Amount of matching contributions made by an employer to a defined contribution plan.

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No definition available.

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- Definition

Period consider for new employees to cover under defined contribution plan.

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No definition available.

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