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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2012
Financial Instruments [Abstract] |
Schedule of cash, cash equivalent and marketable securities |
|  | 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 |  |  | 356,512 |  |  |  | — |  |  |  | — |  |  |  | 356,512 |  |  |  | 356,512 |  |  |  | — |  |  |  | — |
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 |
|  | December 31, 2011 |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Short-Term Marketable Securities |  |  | Long-Term Marketable Securities |
Cash |  | $ | 114,532 |  |  | $ | — |  |  | $ | — |  |  | $ | 114,532 |  |  | $ | 114,532 |  |  | $ | — |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 69,000 |  |  |  | — |  |  |  | — |  |  |  | 69,000 |  |  |  | 69,000 |  |  |  | — |  |  |  | — |
Total |  | $ | 183,532 |  |  | $ | — |  |  | $ | — |  |  | $ | 183,532 |  |  | $ | 183,532 |  |  | $ | — |  |  | $ | — |
Fair value and notional principal amounts of outstanding or unsettled derivative instruments |
|  |  |  |  | December 31, 2012 |
|  | Balance Sheet Caption |  |  | Fair Value of Derivative (2) |  |  |  |  |  | U.S. Dollar Notional |
($ in thousands) |  |  |  |  | Asset |  |  | Liability |  |  |  |
Foreign exchange-forward contracts (current) |  |  | Accrued and other current liabilities | (1) |  | $ | — |  |  | $ | $64 |  |  | $ | 2,710 |
(1) | Current derivative contracts address foreign exchange fluctuations for the Euro versus the U.S. Dollar.
(2) | The fair value of our derivative liability is 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=6872113&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 3 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27198-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: 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=6872113&loc=d3e27337-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19, 20, 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: 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=6872113&loc=d3e27161-111563 Reference 9: 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 10: 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=6872113&loc=d3e27357-111563 + 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 Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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