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Marketable Securities Marketable Securities, Gains and Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Gain (Loss) on Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 26,096	$ 25,490
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	117	90
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(57)	(54)
Available-for-sale Securities, Debt Securities	26,156	25,526
Corporate Debt Securities [Member]
Gain (Loss) on Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	19,804	18,832
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	89	68
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(55)	(43)
Available-for-sale Securities, Debt Securities	19,838	18,857
Municipal Bonds [Member]
Gain (Loss) on Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	6,292	6,658
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	28	22
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(2)	(11)
Available-for-sale Securities, Debt Securities	$ 6,318	$ 6,669

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of debt securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 2
-Subparagraph (b)-(g)
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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