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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2013
Cash, Cash Equivalents, and Investments [Abstract] |
Schedule of Cash, Cash Equivalents and Short-term Investments | 3 Marketable Securities The Company's marketable securities within cash equivalents and investments included in the consolidated balance sheets are detailed as follows (in thousands):
|  |  | December 31, 2013
|  |  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  |  | Cost |  | Gain |  | Loss |  | Value
U.S. Treasury securities |  | $ | 556,438 |  | $ | 111 |  | $ | (10) |  | $ | 556,539
Foreign government securities |  |  | 139,670 |  |  | - |  |  | - |  |  | 139,670
Corporate debt securities |  |  | 629,477 |  |  | 190 |  |  | (233) |  |  | 629,434
Time deposits |  |  | 74,050 |  |  | - |  |  | - |  |  | 74,050
Equity securities |  |  | 77 |  |  | 70 |  |  | - |  |  | 147
| Total |  | $ | 1,399,712 |  | $ | 371 |  | $ | (243) |  | $ | 1,399,840
Amounts included in: |  |  |  |  |  |  |  |  |  |  |  |
| Cash equivalents |  | $ | 36,966 |  | $ | - |  | $ | - |  | $ | 36,966
| Investments |  |  | 1,362,746 |  |  | 371 |  |  | (243) |  |  | 1,362,874
| Total |  | $ | 1,399,712 |  | $ | 371 |  | $ | (243) |  | $ | 1,399,840
|  |  | December 31, 2012
|  |  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  |  | Cost |  | Gain |  | Loss |  | Value
U.S. Treasury securities |  | $ | 470,421 |  | $ | - |  | $ | - |  | $ | 470,421
Foreign government securities |  |  | 313,237 |  |  | - |  |  | - |  |  | 313,237
Corporate debt securities |  |  | 311,607 |  |  | - |  |  | - |  |  | 311,607
Time deposits |  |  | 64,037 |  |  | - |  |  | - |  |  | 64,037
Equity securities |  |  | 1,653 |  |  | - |  |  | (1,583) |  |  | 70
| Total |  | $ | 1,160,955 |  | $ | - |  | $ | (1,583) |  | $ | 1,159,372
Amounts included in: |  |  |  |  |  |  |  |  |  |  |  |
| Cash equivalents |  | $ | 101,382 |  | $ | - |  | $ | - |  | $ | 101,382
| Investments |  |  | 1,059,573 |  |  | - |  |  | (1,583) |  |  | 1,057,990
| Total |  | $ | 1,160,955 |  | $ | - |  | $ | (1,583) |  | $ | 1,159,372
Investments Classified By Contractual Maturity Date [Table Text Block] | The estimated fair value of marketable debt securities by maturity date is as follows (in thousands):
|  |  | December 31, 2013 |  | December 31, 2012
Due in one year or less |  | $ | 1,011,459 |  | $ | 1,057,990
Due after one year through two years |  |  | 314,184 |  |  | -
| Total |  | $ | 1,325,643 |  | $ | 1,057,990

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