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Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2013
Investments All Other Investments [Abstract] |
Schedule of Cash, Cash Equivalents and Marketable Securities | The following tables show our cash and available-for-sale securities’ amortized cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category recorded as cash and cash equivalents or short and long-term marketable securities as of June 30, 2013 and December 31, 2012 (in thousands):
|  | June 30, 2013 |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Short-Term Marketable Securities |  |  | Long-Term Marketable Securities |
Cash |  | $ | 154,775 |  |  | $ | — |  |  | $ | — |  |  | $ | 154,775 |  |  | $ | 154,775 |  |  | $ | — |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 10,963 |  |  |  | — |  |  |  | — |  |  |  | 10,963 |  |  |  | 10,963 |  |  |  | — |  |  |  | — |
Subtotal |  |  | 10,963 |  |  |  | — |  |  |  | — |  |  |  | 10,963 |  |  |  | 10,963 |  |  |  | — |  |  |  | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. agency securities |  |  | 79,048 |  |  |  | 11 |  |  |  | (126 | ) |  |  | 78,933 |  |  |  | — |  |  |  | 29,375 |  |  |  | 49,558 |
U.S. treasury securities |  |  | 49,616 |  |  |  | — |  |  |  | (1 | ) |  |  | 49,615 |  |  |  | 34,320 |  |  |  | 15,295 |  |  |  | — |
Certificates of deposit |  |  | 23,701 |  |  |  | 28 |  |  |  | — |  |  |  | 23,729 |  |  |  | — |  |  |  | 21,127 |  |  |  | 2,602 |
Commercial paper |  |  | 15,492 |  |  |  | 4 |  |  |  | — |  |  |  | 15,496 |  |  |  | — |  |  |  | 15,496 |  |  |  | — |
Corporate securities |  |  | 278,457 |  |  |  | 16 |  |  |  | (1,023 | ) |  |  | 277,450 |  |  |  | — |  |  |  | 109,745 |  |  |  | 167,705 |
Municipal securities |  |  | 5,001 |  |  |  | — |  |  |  | (2 | ) |  |  | 4,999 |  |  |  | — |  |  |  | 4,999 |  |  |  | — |
Subtotal |  |  | 451,315 |  |  |  | 59 |  |  |  | (1,152 | ) |  |  | 450,222 |  |  |  | 34,320 |  |  |  | 196,037 |  |  |  | 219,865 |
Total |  | $ | 617,053 |  |  | $ | 59 |  |  | $ | (1,152 | ) |  | $ | 615,960 |  |  | $ | 200,058 |  |  | $ | 196,037 |  |  | $ | 219,865 |
|  | December 31, 2012 |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Short-Term Marketable Securities |  |  | Long-Term Marketable Securities |
Cash |  | $ | 141,460 |  |  | $ | — |  |  | $ | — |  |  | $ | 141,460 |  |  | $ | 141,460 |  |  | $ | — |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 215,052 |  |  |  | — |  |  |  | — |  |  |  | 215,052 |  |  |  | 215,052 |  |  |  | — |  |  |  | — |
Subtotal |  |  | 215,052 |  |  |  | — |  |  |  | — |  |  |  | 215,052 |  |  |  | 215,052 |  |  |  | — |  |  |  | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. agency securities |  |  | 13,634 |  |  |  | 4 |  |  |  | (3 | ) |  |  | 13,635 |  |  |  | — |  |  |  | 7,635 |  |  |  | 6,000 |
Commercial paper |  |  | 48,710 |  |  |  | 15 |  |  |  | (22 | ) |  |  | 48,703 |  |  |  | 9,999 |  |  |  | 38,704 |  |  |  | — |
Corporate securities |  |  | 162,050 |  |  |  | 12 |  |  |  | (180 | ) |  |  | 161,882 |  |  |  | 1,004 |  |  |  | 67,630 |  |  |  | 93,248 |
Municipal securities |  |  | 5,003 |  |  |  | — |  |  |  | (2 | ) |  |  | 5,001 |  |  |  | — |  |  |  | 5,001 |  |  |  | — |
Subtotal |  |  | 229,397 |  |  |  | 31 |  |  |  | (207 | ) |  |  | 229,221 |  |  |  | 11,003 |  |  |  | 118,970 |  |  |  | 99,248 |
Total |  | $ | 585,909 |  |  | $ | 31 |  |  | $ | (207 | ) |  | $ | 585,733 |  |  | $ | 367,515 |  |  | $ | 118,970 |  |  | $ | 99,248 |
Fair Value and Notional Principal Amounts of Outstanding or Unsettled Derivative Instruments | The following tables show the fair value and notional principal amounts of our outstanding or unsettled derivative instruments that are not designated as hedging instruments (in thousands):
|  | Balance Sheet Caption |  | June 30, 2013 |
|  |  |  | Fair Value of Derivative (2) |  |  | U.S. Dollar Notional |
|  |  |  | Asset |  |  | Liability |  |  |  |
Foreign exchange-forward contracts (current) |  | Accrued and other current liabilities (1) |  | $ | — |  |  | $ | 1 |  |  | $ | 23,042 |
|  | Balance Sheet Caption |  | December 31, 2012 |
|  |  |  | Fair Value of Derivative (2) |  |  | U.S. Dollar Notional |
|  |  |  | Asset |  |  | Liability |  |  |  |
Foreign exchange-forward contracts (current) |  | Accrued and other current liabilities (1) |  | $ | — |  |  | $ | 64 |  |  | $ | 2,710 |
(1) | Derivative contracts address foreign exchange fluctuations for the Euro versus the U.S. dollar.
(2) | The fair value of our derivatives are measured using Level 2 fair value inputs, as we use a pricing model that takes into account the contract terms as well as current foreign currency exchange rates in active markets.

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale 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 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 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 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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