Retirement Plans (Details 2) (USD $)
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3 Months Ended | 9 Months Ended | ||
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Employees' savings plan | ||||
Matching contribution by the company (as a percent) | 100.00% | |||
Matching contribution by the company prior to September 1, 2012 (as a percent) | 50.00% | |||
Expenses recognized under 401(K) plan | $ 418,000 | $ 240,000 | $ 1,100,000 | $ 720,000 |
Minimum
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Employees' savings plan | ||||
Age of employees to be eligible to participate in the defined contribution plan (in years) | 21 years | |||
Percentage of annual base compensation that participants may elect to contribute | 1.00% | |||
Maximum
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Employees' savings plan | ||||
Percentage of annual base compensation that participants may elect to contribute | 50.00% | |||
Percentage of employees salary for which the company contributes a matching contribution | 5.00% | |||
Percentage of employees salary for which the company contributes a matching contribution, prior to September 1, 2012 | 6.00% |