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Fair Value of Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2015
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:
| March 31, 2015 |  | December 31, 2014
| Cost |  | Fair Value |  | Cost |  | Fair Value
Cash and Cash Equivalents: |  |  |  |  |  |  |
Cash and overnight deposits | $ | 548,705 |  |  | 548,705 |  |  | 531,312 |  |  | 531,312 |
Corporate commercial paper | 441,254 |  |  | 441,332 |  |  | 356,468 |  |  | 356,536 |
Time deposits | 43,185 |  |  | 43,185 |  |  | 39,327 |  |  | 39,327 |
Total cash and cash equivalents | 1,033,144 |  |  | 1,033,222 |  |  | 927,107 |  |  | 927,175 |
Short-Term Investments: |  |  |  |  |  |  |
Corporate commercial paper | — |  |  | — |  |  | 40,295 |  |  | 40,350 |
Time deposits | 61 |  |  | 61 |  |  | 41 |  |  | 41 |
Total short-term investments | 61 |  |  | 61 |  |  | 40,336 |  |  | 40,391 |
Total | $ | 1,033,205 |  |  | 1,033,283 |  |  | 967,443 |  |  | 967,566 |

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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=36462937&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=49121117&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=49121117&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=49121117&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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