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Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | --- | ---
Schedule of cash, cash equivalent and marketable securities |  |  |  |
Amortized Cost | $ 585,909 | $ 183,532 |  |
Unrealized Gains | 31 |  |  |
Unrealized Losses | (207) |  |  |
Fair Value | 585,733 | 183,532 |  |
Cash and Cash Equivalents | 367,515 | 183,532 | 93,133 | 31,364
Short-Term Marketable Securities | 118,970 |  |  |
Long-Term Marketable Securities | 99,248 |  |  |
Level 1 [Member] |  |  |  |
Schedule of cash, cash equivalent and marketable securities |  |  |  |
Amortized Cost | 356,512 |  |  |
Unrealized Gains |  |  |  |
Unrealized Losses |  |  |  |
Fair Value | 356,512 |  |  |
Cash and Cash Equivalents | 356,512 |  |  |
Short-Term Marketable Securities |  |  |  |
Long-Term Marketable Securities |  |  |  |
Level 1 [Member] | Money Market Funds [Member] |  |  |  |
Schedule of cash, cash equivalent and marketable securities |  |  |  |
Amortized Cost | 215,052 | 69,000 |  |
Unrealized Gains |  |  |  |
Unrealized Losses |  |  |  |
Fair Value | 215,052 | 69,000 |  |
Cash and Cash Equivalents | 215,052 | 69,000 |  |
Short-Term Marketable Securities |  |  |  |
Long-Term Marketable Securities |  |  |  |
Level 2 [Member] |  |  |  |
Schedule of cash, cash equivalent and marketable securities |  |  |  |
Amortized Cost | 229,397 |  |  |
Unrealized Gains | 31 |  |  |
Unrealized Losses | (207) |  |  |
Fair Value | 229,221 |  |  |
Cash and Cash Equivalents | 11,003 |  |  |
Short-Term Marketable Securities | 118,970 |  |  |
Long-Term Marketable Securities | 99,248 |  |  |
Level 2 [Member] | U.S. agency securities [Member] |  |  |  |
Schedule of cash, cash equivalent and marketable securities |  |  |  |
Amortized Cost | 13,634 |  |  |
Unrealized Gains | 4 |  |  |
Unrealized Losses | (3) |  |  |
Fair Value | 13,635 |  |  |
Short-Term Marketable Securities | 7,635 |  |  |
Long-Term Marketable Securities | 6,000 |  |  |
Level 2 [Member] | Commercial paper [Member] |  |  |  |
Schedule of cash, cash equivalent and marketable securities |  |  |  |
Amortized Cost | 48,710 |  |  |
Unrealized Gains | 15 |  |  |
Unrealized Losses | (22) |  |  |
Fair Value | 48,703 |  |  |
Cash and Cash Equivalents | 9,999 |  |  |
Short-Term Marketable Securities | 38,704 |  |  |
Level 2 [Member] | Corporate securities [Member] |  |  |  |
Schedule of cash, cash equivalent and marketable securities |  |  |  |
Amortized Cost | 162,050 |  |  |
Unrealized Gains | 12 |  |  |
Unrealized Losses | (180) |  |  |
Fair Value | 161,882 |  |  |
Cash and Cash Equivalents | 1,004 |  |  |
Short-Term Marketable Securities | 67,630 |  |  |
Long-Term Marketable Securities | 93,248 |  |  |
Level 2 [Member] | Municipal securities [Member] |  |  |  |
Schedule of cash, cash equivalent and marketable securities |  |  |  |
Amortized Cost | 5,003 |  |  |
Unrealized Losses | (2) |  |  |
Fair Value | 5,001 |  |  |
Short-Term Marketable Securities | 5,001 |  |  |
Cash [Member] |  |  |  |
Schedule of cash, cash equivalent and marketable securities |  |  |  |
Amortized Cost, Cash | 141,460 | 114,532 |  |
Unrealized Gains, Cash |  |  |  |
Unrealized Losses, Cash |  |  |  |
Fair Value, Cash | 141,460 | 114,532 |  |
Cash and Cash Equivalents, Cash | 141,460 | 114,532 |  |
Short-Term Marketable Securities, Cash |  |  |  |
Long-Term Marketable Securities, Cash |  |  |  |

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