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Share Based and Deferred Compensation 401(K) Plan (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent | 100.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 0.4 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 0.4 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 0.4 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration