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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Details) (USD $)
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Jun. 30, 2013
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Dec. 31, 2012
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|---|---|---|
| Assets: | ||
| Marketable securities: | $ 7,775,000 | $ 20,604,000 |
| Long-term marketable equity securities | ||
| Gross unrealized losses | 0 | 0 |
| Gross unrealized gain | 6,772,000 | 6,996,000 |
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Equity securities
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| Long-term marketable equity securities | ||
| Cost basis | 42,100,000 | 42,100,000 |
| Gross unrealized losses | 500,000 | 10,800,000 |
| Gross unrealized gain | 1,400,000 | |
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Fair value on a recurring basis | Quoted Market Prices in Active Markets for Identical Assets (Level 1)
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| Assets: | ||
| Total Assets | 370,684,000 | 583,511,000 |
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Fair value on a recurring basis | Quoted Market Prices in Active Markets for Identical Assets (Level 1) | Money market funds
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| Assets: | ||
| Cash equivalents: | 320,989,000 | 545,290,000 |
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Fair value on a recurring basis | Quoted Market Prices in Active Markets for Identical Assets (Level 1) | Equity security
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| Assets: | ||
| Marketable securities: | 6,761,000 | 6,977,000 |
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Fair value on a recurring basis | Quoted Market Prices in Active Markets for Identical Assets (Level 1) | Equity securities
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| Assets: | ||
| Long-term investments: | 42,934,000 | 31,244,000 |
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Fair value on a recurring basis | Significant Other Observable Inputs (Level 2)
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| Assets: | ||
| Total Assets | 211,465,000 | 25,621,000 |
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Fair value on a recurring basis | Significant Other Observable Inputs (Level 2) | Commercial paper
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| Assets: | ||
| Cash equivalents: | 109,629,000 | |
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Fair value on a recurring basis | Significant Other Observable Inputs (Level 2) | Time deposits
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| Assets: | ||
| Cash equivalents: | 100,822,000 | 11,994,000 |
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Fair value on a recurring basis | Significant Other Observable Inputs (Level 2) | Corporate debt securities
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| Assets: | ||
| Marketable securities: | 1,014,000 | 13,627,000 |
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Fair value on a recurring basis | Significant Unobservable Inputs (Level 3)
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| Assets: | ||
| Total Assets | 8,760,000 | 8,100,000 |
| Liabilities: | ||
| Contingent consideration arrangement | (46,912,000) | |
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Fair value on a recurring basis | Significant Unobservable Inputs (Level 3) | Auction rate security
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| Assets: | ||
| Long-term investments: | 8,760,000 | 8,100,000 |
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Fair value on a recurring basis | Fair Value
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| Assets: | ||
| Total Assets | 590,909,000 | 617,232,000 |
| Liabilities: | ||
| Contingent consideration arrangement | (46,912,000) | |
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Fair value on a recurring basis | Fair Value | Money market funds
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| Assets: | ||
| Cash equivalents: | 320,989,000 | 545,290,000 |
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Fair value on a recurring basis | Fair Value | Commercial paper
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| Assets: | ||
| Cash equivalents: | 109,629,000 | |
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Fair value on a recurring basis | Fair Value | Time deposits
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| Assets: | ||
| Cash equivalents: | 100,822,000 | 11,994,000 |
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Fair value on a recurring basis | Fair Value | Corporate debt securities
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| Assets: | ||
| Marketable securities: | 1,014,000 | 13,627,000 |
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Fair value on a recurring basis | Fair Value | Equity security
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| Assets: | ||
| Marketable securities: | 6,761,000 | 6,977,000 |
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Fair value on a recurring basis | Fair Value | Auction rate security
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| Assets: | ||
| Long-term investments: | 8,760,000 | 8,100,000 |
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Fair value on a recurring basis | Fair Value | Equity securities
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| Assets: | ||
| Long-term investments: | $ 42,934,000 | $ 31,244,000 |