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Fair Value Measurements Hierarchy Table (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2012
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Dec. 31, 2011
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Level 1
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| Assets [Abstract] | ||||||||
| Total | $ 240,280 | $ 225,001 | ||||||
| Liabilities [Abstract] | ||||||||
| Total | 0 | 165 | ||||||
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Level 2
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| Assets [Abstract] | ||||||||
| Total | 128,605 | 32,672 | ||||||
| Liabilities [Abstract] | ||||||||
| Total | 24,769 | 23,800 | ||||||
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Level 3
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| Assets [Abstract] | ||||||||
| Total | 24,588 | 56,276 | ||||||
| Liabilities [Abstract] | ||||||||
| Total | 184 | 59,441 | ||||||
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Total [Member]
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| Assets [Abstract] | ||||||||
| Total | 393,473 | 313,949 | ||||||
| Liabilities [Abstract] | ||||||||
| Total | 24,953 | 83,406 | ||||||
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Marketable Securities [Member] | Level 1
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| Assets [Abstract] | ||||||||
| Marketable securities | 128,123 | [1] | ||||||
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Marketable Securities [Member] | Level 2
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| Assets [Abstract] | ||||||||
| Marketable securities | 69,222 | [1] | ||||||
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Marketable Securities [Member] | Level 3
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| Assets [Abstract] | ||||||||
| Marketable securities | 1,783 | [1] | ||||||
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Marketable Securities [Member] | Total [Member]
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| Assets [Abstract] | ||||||||
| Marketable securities | 199,128 | [1] | ||||||
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Other Long-term Investments [Member] | Level 1
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| Assets [Abstract] | ||||||||
| Long-term investments | 112,030 | [1] | 225,001 | [1] | ||||
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Other Long-term Investments [Member] | Level 2
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| Assets [Abstract] | ||||||||
| Long-term investments | 59,383 | [1] | 32,672 | [1] | ||||
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Other Long-term Investments [Member] | Level 3
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| Assets [Abstract] | ||||||||
| Long-term investments | 21,784 | [1] | 56,276 | [1] | ||||
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Other Long-term Investments [Member] | Total [Member]
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| Assets [Abstract] | ||||||||
| Long-term investments | 193,197 | [1] | 313,949 | [1] | ||||
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Noncontrolling Interest | Level 1
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| Assets [Abstract] | ||||||||
| Non-controlling interests in certain funds | 0 | [2] | ||||||
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Noncontrolling Interest | Level 2
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| Assets [Abstract] | ||||||||
| Non-controlling interests in certain funds | 0 | [2] | ||||||
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Noncontrolling Interest | Level 3
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| Assets [Abstract] | ||||||||
| Non-controlling interests in certain funds | 1,021 | [2] | ||||||
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Noncontrolling Interest | Total [Member]
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| Assets [Abstract] | ||||||||
| Non-controlling interests in certain funds | 1,021 | [2] | ||||||
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Commodity contracts on precious metals [Member] | Level 1
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| Assets [Abstract] | ||||||||
| Commodity contracts on precious metals | 127 | |||||||
| Liabilities [Abstract] | ||||||||
| Financial instruments | 0 | 165 | ||||||
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Commodity contracts on precious metals [Member] | Level 2
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| Assets [Abstract] | ||||||||
| Commodity contracts on precious metals | 0 | |||||||
| Liabilities [Abstract] | ||||||||
| Financial instruments | 27 | 64 | ||||||
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Commodity contracts on precious metals [Member] | Level 3
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| Assets [Abstract] | ||||||||
| Commodity contracts on precious metals | 0 | |||||||
| Liabilities [Abstract] | ||||||||
| Financial instruments | 0 | 0 | ||||||
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Commodity contracts on precious metals [Member] | Total [Member]
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| Assets [Abstract] | ||||||||
| Commodity contracts on precious metals | 127 | |||||||
| Liabilities [Abstract] | ||||||||
| Financial instruments | 27 | 229 | ||||||
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Financial instruments [Member] | Level 1
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| Liabilities [Abstract] | ||||||||
| Financial instruments | 0 | 0 | ||||||
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Financial instruments [Member] | Level 2
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| Liabilities [Abstract] | ||||||||
| Financial instruments | 24,742 | 23,736 | ||||||
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Financial instruments [Member] | Level 3
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| Liabilities [Abstract] | ||||||||
| Financial instruments | 0 | 0 | ||||||
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Financial instruments [Member] | Total [Member]
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| Liabilities [Abstract] | ||||||||
| Financial instruments | 24,742 | 23,736 | ||||||
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Deferred Features of Subordinated Note [Member] | Level 1
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| Liabilities [Abstract] | ||||||||
| Deferred fee liability to related party | 0 | |||||||
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Deferred Features of Subordinated Note [Member] | Level 2
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| Liabilities [Abstract] | ||||||||
| Deferred fee liability to related party | 0 | |||||||
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Deferred Features of Subordinated Note [Member] | Level 3
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| Liabilities [Abstract] | ||||||||
| Deferred fee liability to related party | 58,747 | |||||||
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Deferred Features of Subordinated Note [Member] | Total [Member]
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| Liabilities [Abstract] | ||||||||
| Deferred fee liability to related party | 58,747 | |||||||
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Derivative features of subordinated notes [Member] | Level 1
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| Liabilities [Abstract] | ||||||||
| Derivative features of subordinated notes | 0 | 0 | ||||||
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Derivative features of subordinated notes [Member] | Level 2
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| Liabilities [Abstract] | ||||||||
| Derivative features of subordinated notes | 0 | 0 | ||||||
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Derivative features of subordinated notes [Member] | Level 3
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| Liabilities [Abstract] | ||||||||
| Derivative features of subordinated notes | 184 | 694 | ||||||
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Derivative features of subordinated notes [Member] | Total [Member]
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| Liabilities [Abstract] | ||||||||
| Derivative features of subordinated notes | $ 184 | $ 694 | ||||||
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