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Availabe-for-Sale-Securities Available-for-Sale-Securities (Notes) | 12 Months Ended
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Dec. 31, 2015
Available-for-sale Securities [Abstract] |
Cash, Cash Equivalents, and Marketable Securities [Text Block] | Available-for-Sale-Securities 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):
| December 31, 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 |  |  | $ | 249.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 249.0 |
Corporate debt securities | 1,047.2 |  |  | — |  |  | — |  |  | 1,047.2 |  |  | — |  |  | — |  |  | — |  |  | — |
Money market funds | 837.7 |  |  | — |  |  | — |  |  | 837.7 |  |  | 12,791.9 |  |  | — |  |  | — |  |  | 12,791.9 |
Municipal debt securities | 4,740.9 |  |  | 0.8 |  |  | — |  |  | 4,741.7 |  |  | 9,317.3 |  |  | 1.3 |  |  | — |  |  | 9,318.6 |
Total | $ | 6,874.8 |  |  | $ | 0.8 |  |  | $ | — |  |  | $ | 6,875.6 |  |  | $ | 22,358.2 |  |  | $ | 1.3 |  |  | $ | — |  |  | $ | 22,359.5 |
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):
| December 31, 2015 |  | December 31, 2014
Cash and cash equivalents | $ | 6,875.6 |  |  | $ | 15,279.4 |
Marketable securities | — |  |  | 7,080.1 |
Total | $ | 6,875.6 |  |  | $ | 22,359.5 |
The following table summarizes our portfolio of available-for-sale debt securities by contractual maturity (in thousands):
| December 31, 2015
| Amortized Cost |  | Estimated Fair Value
Less than one year | $ | 6,874.8 |  |  | $ | 6,875.6 |
Greater than one year | — |  |  | — |
Total | $ | 6,874.8 |  |  | $ | 6,875.6 |

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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References No definition available. + Details
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