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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, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Stock-based compensation activity, including both continuing and discontinued operations |  |  |
Stock-based compensation expense recognized in operating expenses | $ 10,205 | $ 6,133 | $ 3,338
Tax benefit of stock-based compensation expense in provision for income taxes | 3,610 | 2,261 | 1,212
Stock-based compensation expense, net of tax | 6,595 | 3,872 | 2,126
Fair value of shares vested | 10,195 | 6,194 | 3,577
Issuance of Company's common stock | 4,925 | 214 | 17,948
Tax benefit from exercise of stock-based compensation, including (shortfall) tax benefits | (233) | (1,554) | (2,430)
Stock-based compensation cost capitalized in inventory | $ 335 | $ 345 | $ 284
1994 Plan |  |  |
Stock-Based Compensation |  |  |
Requisite service period for options to vest | 4 years |  |
Expiration period for options granted | 7 years |  |
Age after which vesting of options granted accelerates if the grantee ceases to be employed by the entity | 60 years |  |
2011 Plan |  |  |
Stock-Based Compensation |  |  |
Maximum common stock shares that may be issued under plan | 16.3 |  |

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