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401(k) Plan (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Compensation and Retirement Disclosure [Abstract]
Defined contribution plan, employer matching contribution, percent	50.00%
Defined contribution plan, vesting period	5 years
Defined contribution plan, employer matching contribution, amount	$ 352	$ 335	$ 326
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.00%

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- Definition

Defined Contribution Plan, Employer Matching Contribution, Amount

+ References

No definition available.

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- Definition

Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay

+ References

No definition available.

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- Definition

Defined Contribution Plan, Vesting Period

+ References

No definition available.

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- Details

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

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