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Basis of Presentation (Details 3) (USD $) Share data in Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Stock-based compensation activity, including both continuing and discontinued operations |  |
Stock-based compensation expense recognized in operating expenses | $ 3,068,000 | $ 1,449,000
Tax benefit of stock-based compensation expense in provision for income taxes | 1,066,000 | 522,000
Stock-based compensation expense, net of tax | 2,002,000 | 927,000
Fair value of shares vested | 3,110,000 | 1,281,000
Proceeds to the Company from the exercise of stock-based compensation | 1,758,000 | 154,000
Tax benefit from exercise of stock-based compensation, including (shortfall) tax benefits | (2,000) | (39,000)
Stock-based compensation cost capitalized in inventory | 387,000 | 115,000
Fair value of financial instruments |  |
United States Treasury securities and money market funds included in cash equivalents | 70,000,000 |
Income Taxes |  |
Effective tax rate (as a percent) | 46.90% | 42.60%
Provision for income taxes | $ 6,372,000 | $ 5,263,000
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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