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Available-for-Sale-Securities (Tables) | 6 Months Ended
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Jun. 30, 2014
Available-for-sale Securities [Abstract] |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] | The following table is a summary of available-for-sale securities recorded in cash and cash equivalents or marketable securities in our Consolidated Balance Sheets (in thousands):
| June 30, 2014
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Certificate of deposits | $ | 744.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 744.0 |
Money market funds | 21,051.0 |  |  | — |  |  | — |  |  | 21,051.0 |
Municipal debt securities | 6,581.3 |  |  | 1.1 |  |  | (0.1 | ) |  | 6,582.3 |
Total | $ | 28,376.3 |  |  | $ | 1.1 |  |  | $ | (0.1 | ) |  | $ | 28,377.3 |
Marketable Securities [Table Text Block] | Estimated fair values of available-for-sale securities are generally based on prices obtained from commercial pricing services. The following table summarizes the classification of the available-for-sale debt securities on our Consolidated Balance Sheets (in thousands):
| June 30, 2014
Cash and cash equivalents | $ | 27,456.5 |
Marketable securities | 920.8 |
Total | $ | 28,377.3 |
Investments Classified by Contractual Maturity Date [Table Text Block] | The following table summarizes our portfolio of available-for-sale debt securities by contractual maturity (in thousands):
| June 30, 2014
| Amortized Cost |  | Estimated Fair Value
Less than one year | $ | 28,376.3 |  |  | $ | 28,377.3 |
Greater than one year | — |  |  | — |
Total | $ | 28,376.3 |  |  | $ | 28,377.3 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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