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Operations and Summary of Significant Accounting Policies (Details 3) (USD $) In Thousands, except Share data in Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Stock-based compensation activity, including both continuing and discontinued operations |  |  |
Stock-based compensation expense recognized in operating expenses | $ 6,133 | $ 3,338 | $ 1,746
Tax benefit of stock-based compensation expense in provision for income taxes | 2,261 | 1,212 | 544
Stock-based compensation expense, net of tax | 3,872 | 2,126 | 1,202
Fair value of shares vested | 6,194 | 3,577 | 1,690
Proceeds to the Company from the exercise of stock-based compensation | 214 | 17,948 | 7,627
Tax benefit from exercise of stock-based compensation, including (shortfall) tax benefits | (1,554) | (2,430) | (445)
Stock-based compensation cost capitalized in inventory | $ 345 | $ 284 | $ 45
1994 Plan |  |  |
Stock-Based Compensation |  |  |
Requisite service period for options to vest (in years) | 4 years |  |
Expiration period for options granted (in years) | P7Y |  |
Age after which vesting of options granted accelerates if the grantee ceases to be employed by the entity (in years) | 60 |  |
2011 Plan |  |  |
Stock-Based Compensation |  |  |
Maximum common stock shares that may be issued under plan | 16.3 |  |

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