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Share-based Payments Share-Based Payments Plan (Details)
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12 Months Ended |
|---|---|
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Dec. 31, 2011
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| Share-based Compensation Arrangement by Share-based Payment Award | |
| Share-based compensation arrangement, minimum vesting period | 3 |
| Share-based compensation arrangement, maximum vesting period | 4 |
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1995 Plan
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| Share-based Compensation Arrangement by Share-based Payment Award | |
| Share-based compensation arrangement, contractual term | 15 years |
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2004 Plan
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|
| Share-based Compensation Arrangement by Share-based Payment Award | |
| Share-based compensation arrangement, shares authorized | 40,500,000 |
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2010 Plan
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|
| Share-based Compensation Arrangement by Share-based Payment Award | |
| Share-based compensation arrangement, shares authorized | 18,075,825 |
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2004 and 2010 Plans
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| Share-based Compensation Arrangement by Share-based Payment Award | |
| Share-based compensation arrangement, contractual term | 10 years |