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Marketable Equity Securities - Marketable Equity Securities and Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Marketable equity securities at fair value	$ 1,710us-gaap_InvestmentsFairValueDisclosure	$ 2,308us-gaap_InvestmentsFairValueDisclosure
Cost	1,869us-gaap_InvestmentOwnedAtCost	1,869us-gaap_InvestmentOwnedAtCost
Accumulated other comprehensive (loss) income for unrealized holding gains	(159)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax	439us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
Deferred taxes on accumulated other comprehensive income for unrealized holding gains	(1,559)us-gaap_DeferredTaxAssetsOtherComprehensiveLoss	(1,559)us-gaap_DeferredTaxAssetsOtherComprehensiveLoss
Accumulated other comprehensive income	$ (1,718)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	$ (1,120)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax

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Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14A

-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580



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Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from unrealized losses in other comprehensive income.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

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-Subparagraph a, f, g

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