Employee Retirement Plans - Defined Contribution and Nonqualified Plans(Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined contribution plan
Company's matching contributions	$ 255	$ 213	$ 198
Non-discretionary employer contributions	1,021	807	871
Non-qualified plan
Employee retirement plans
Expense	509	450
Amount accrued	$ 1,708	$ 1,105

Represents amount of non-discretionary contributions made by an employer to a defined contribution plan.

No definition available.

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- Definition

The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

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-Section 50

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- Definition

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

+ References

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- Definition

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

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