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Marketable Securities Securities in unrealized loss position (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 8,371
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (54)
Short-term Investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 559
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (2)
Other Long-term Investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 7,812
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (52)
Corporate Debt Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 6,891
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (43)
Corporate Debt Securities [Member] | Short-term Investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 204
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (1)
Corporate Debt Securities [Member] | Other Long-term Investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 6,687
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (42)
Municipal Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 1,480
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (11)
Municipal Bonds [Member] | Short-term Investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 355
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (1)
Municipal Bonds [Member] | Other Long-term Investments [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 1,125
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ (10)

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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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