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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2014
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investment Securities | Investment securities consisted of the following (in thousands):
| March 31, 2014 |  | December 31, 2013
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value (net carrying amount) |  | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value (net carrying amount)
Domestic and foreign corporate bonds | $ | 214,802 |  |  | $ | 164 |  |  | $ | (76 | ) |  | $ | 214,890 |  |  | $ | 221,418 |  |  | $ | 140 |  |  | $ | (124 | ) |  | $ | 221,434 |
Commercial paper | 39,930 |  |  | 13 |  |  | (10 | ) |  | 39,933 |  |  | 32,941 |  |  | 16 |  |  | (3 | ) |  | 32,954 |
| $ | 254,732 |  |  | $ | 177 |  |  | $ | (86 | ) |  | $ | 254,823 |  |  | $ | 254,359 |  |  | $ | 156 |  |  | $ | (127 | ) |  | $ | 254,388 |
Investments by Contractual Maturity | The fair value of these investment securities at March 31, 2014, by contractual maturity, are as follows (in thousands):
| Fair value
Due in one year or less | $ | 218,876 |
Due after one year through two years | 35,947 |
| $ | 254,823 |

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