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Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Benefit Plan [Abstract]
Maximum compensation deferred subject to limitations (in hundredths)	10000.00%
Deferred compensation arrangement with individual, description	Employees age 18 and older are eligible to contribute to the plan starting the first day of employment
Requisite service period	After completing at least one day of service, employees are eligible to receive matching contributions from the Company
Employer matched employees' base pay (in hundredths)	400.00%	400.00%	400.00%
Company's contribution evenly vest (in years)	4Y
Company's contributions cliff vest (in years)	2Y
Compensation expense	$ 2.4	$ 2.3	$ 2.1
Additional deferred compensation arrangement, percentage of employees pay, maximum (in hundredths)	1000.00%
Additional deferred compensation contribution	3.5	2.1
Accrued pension liability	7.6	8.4	7.4
Pension expense	$ 1.1	$ 0.9	$ 1.1

X

- Definition

The maximum percentage of employees pay that the entity will be required to contribute in addition to regular contributions in the event that certain approved achievements are met under the "retire ready" contribution program.

+ References

No definition available.

+ Details

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X

- Definition

This element represent the specific period of time that employees earn the right to receive benefits from the plan.

+ References

No definition available.

+ Details

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X

- Definition

This element represents the period of time that employer's contribution to deferred compensation plan vests.

+ References

No definition available.

+ Details

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- Definition

The amount of payment into the fund in addition to regular required contribution, attributable to approved achievements were met under the "retire ready" contribution program.

+ References

No definition available.

+ Details

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X

- Definition

This element represent percentage of employee's base salary matched by the company.

+ References

No definition available.

+ Details

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X

- Definition

The maximum percentage of compensation that can be deferred by participating employees.

+ References

No definition available.

+ Details

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X

- Definition

Description of the deferred compensation arrangement, including fixed amounts and determinable awards, or the method for determining payments and awards, the timing of such payments and awards, and any requisite service or performance criteria, as of the balance sheet date.

+ References

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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-Paragraph 64, 65

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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- Definition

The minimum period that the individual is required to perform services in order to be fully vested under the deferred compensation arrangement.

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- Definition

This represents the entire liability recognized in the balance sheet that is associated with the defined benefit pension plans.

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

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- Definition

The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

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