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Retirement and Share-based Compensation Plans (Defined Contribution Plan) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Defined contribution plan, maximum annual employee contribution	$ 17,500us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount	$ 17,500us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount	$ 17,000us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount
Defined contribution plan, employer plan contributions	$ 423,000us-gaap_DefinedContributionPlanCostRecognized	$ 391,000us-gaap_DefinedContributionPlanCostRecognized	$ 370,000us-gaap_DefinedContributionPlanCostRecognized

X

- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

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X

- Definition

Maximum amount the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Details

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