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Financial Instruments Available-for-sale Securities (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 15,044 | $ 239,113
GrossUnrealizedGain | 6,022 | 434
GrossUnrealizedLoss | 0 | (159)
Fair Value | (21,066) | (239,388)
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax | 3,858 | 176
Available-for-sale Securities, Income Tax Expense on Change in Unrealized Holding Gain (Loss) | 2,164 | 99
Proceeds from Sale of Available-for-sale Securities | 342,045 |
Gross Realized Gains | 1,311 |
Gross Realized Losses | (99) |
Corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost |  | 108,300
GrossUnrealizedGain |  | 340
GrossUnrealizedLoss |  | (69)
Fair Value |  | (108,571)
U.S. government debt |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost |  | 106,335
GrossUnrealizedGain |  | 60
GrossUnrealizedLoss |  | (79)
Fair Value |  | (106,316)
Asset-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost |  | 24,478
GrossUnrealizedGain |  | 34
GrossUnrealizedLoss |  | (11)
Fair Value |  | (24,501)
Equity Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 15,044 |
GrossUnrealizedGain | 6,022 |
GrossUnrealizedLoss | 0 |
Fair Value | $ (21,066) |

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- Definition 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=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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- Definition Amount of investment in debt and equity 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 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: 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 + Details
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