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Fair Value Measurements (Details) (USD $)
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3 Months Ended |
6 Months Ended |
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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Dec. 31, 2011
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |
$ 6,081,000 |
$ 15,920,000 |
$ 6,081,000 |
$ 15,920,000 |
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| Cash and Cash Equivalents, Fair Value Disclosure |
607,457,000 |
|
607,457,000 |
|
750,004,000 |
| Short-term Investments |
3,952,000 |
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3,952,000 |
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| Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |
17,600,000 |
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17,600,000 |
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| Liabilities, Fair Value Disclosure |
7,325,000 |
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7,325,000 |
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13,218,000 |
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Fair Value, Inputs, Level 3 [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Liabilities, Fair Value Disclosure |
6,081,000 |
|
6,081,000 |
|
11,230,000 |
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Fair Value, Inputs, Level 2 [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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|
|
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| Liabilities, Fair Value Disclosure |
1,244,000 |
|
1,244,000 |
|
1,988,000 |
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F-Tuan JV [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Cost Method Investments |
$ 128,074,000 |
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$ 128,074,000 |
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