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Investment Securities | 3 Months Ended
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Mar. 31, 2014
Investments, Debt and Equity Securities [Abstract] |
Investment Securities | 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 |
For investments with unrealized losses as of March 31, 2014 and December 31, 2013, the Company has determined that (i) it does not have the intent to sell any of these investments, and (ii) it is not likely that the Company will be required to sell these investments prior to the recovery of the amortized cost. Accordingly, the Company has determined that no other-than-temporary impairments exist at the reporting dates. The Company obtains pricing information in determining the fair value of its available-for-sale securities from independent pricing vendors. Based on management’s inquiries, the pricing vendors use various pricing models consistent with what other market participants would use. The assumptions and inputs used by the pricing vendors are derived from market observable sources including: reported trades, broker/dealer quotes, issuer spreads, benchmark curves, bids, offers and other market-related data. The Company has not made adjustments to such prices. Each quarter, the Company validates the fair value pricing methodology to determine the fair value is consistent with applicable accounting guidance and to confirm that the securities are classified properly in the fair value hierarchy. The Company compares the pricing received from its vendors to independent sources for the same or similar securities. 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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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -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 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 + Details
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