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Available-for-Sale-Securities (Tables) | 6 Months Ended
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Jun. 30, 2015
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, 2015 |  | December 31, 2014
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Certificate of deposits | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 249.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 249.0 |
Corporate debt securities | 1,065.0 |  |  | — |  |  | (1.8 | ) |  | 1,063.2 |  |  | — |  |  | — |  |  | — |  |  | — |
Money market funds | 11,635.0 |  |  | — |  |  | — |  |  | 11,635.0 |  |  | 12,791.9 |  |  | — |  |  | — |  |  | 12,791.9 |
Municipal debt securities | 15,620.5 |  |  | 3.7 |  |  | — |  |  | 15,624.2 |  |  | 9,317.3 |  |  | 1.3 |  |  | — |  |  | 9,318.6 |
Total | $ | 28,320.5 |  |  | $ | 3.7 |  |  | $ | (1.8 | ) |  | $ | 28,322.4 |  |  | $ | 22,358.2 |  |  | $ | 1.3 |  |  | $ | — |  |  | $ | 22,359.5 |
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, 2015 | December 31, 2014
Cash and cash equivalents | $ | 25,310.7 |  | $ | 15,279.4 |
Marketable securities | 3,011.7 |  | 7,080.1 |
Total | $ | 28,322.4 |  | $ | 22,359.5 |
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, 2015
| Amortized Cost |  | Estimated Fair Value
Less than one year | $ | 28,320.5 |  |  | $ | 28,322.4 |
Greater than one year | — |  |  | — |
Total | $ | 28,320.5 |  |  | $ | 28,322.4 |

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