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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2013
Fair Value Disclosures [Abstract] |
Schedule of Fair value of Cash and Cash Equivalents by Balance Sheet Grouping | Cash, cash equivalents and short-term investments consist of the following:
|  | December 31, 2013 |  | December 31, 2012
|  | Cost |  | Fair Value |  | Cost |  | Fair Value
Cash and cash equivalents: |  |  |  |  |  |  |  |
Cash and overnight deposits |  | $ | 590,317 |  |  | 590,317 |  |  | 458,169 |  |  | 458,169 |
Corporate commercial paper |  | 629,923 |  |  | 629,990 |  |  | 642,884 |  |  | 642,886 |
Time deposits |  | 27,412 |  |  | 27,412 |  |  | 159,789 |  |  | 159,789 |
Total cash and cash equivalents |  | 1,247,652 |  |  | 1,247,719 |  |  | 1,260,842 |  |  | 1,260,844 |
Short-term investments: |  |  |  |  |  |  |  |
Corporate commercial paper |  | 26,296 |  |  | 26,321 |  |  | — |  |  | — |
Time deposits |  | 41 |  |  | 41 |  |  | 139 |  |  | 139 |
Total short-term investments |  | 26,337 |  |  | 26,362 |  |  | 139 |  |  | 139 |
Total |  | $ | 1,273,989 |  |  | 1,274,081 |  |  | 1,260,981 |  |  | 1,260,983 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 + Details
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