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Share-Based Compensation (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Y Age	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Incentive Plan [Member]	Sep. 27, 2008 Incentive Plan [Member]	Dec. 31, 2011 Employee Stock Purchase Plan [Member]	May 18, 2011 Restricted Stock Grants [Member]	May 18, 2010 Restricted Stock Grants [Member]	Nov. 10, 2009 Restricted Stock Grants [Member]	May 19, 2009 Restricted Stock Grants [Member]	Mar. 03, 2009 Restricted Stock Grants [Member]
Additional Share-based Compensation (Textual) [Abstract]
Common stock authorized				8,729	4,200,000	1,050
Percentage increase in the number of shares authorized for issuance under the Incentive Plan				2.50%
University granted, common stock							2,608,000	1,391,000	1,141,000	2,491,000	1,307,000
Granted fair value							$ 13.42	$ 25.16	$ 17.54	$ 14.05	$ 15.30
Share-based Compensation (Textual) [Abstract]
Value of closing stock price	$ (15.96)
Unrecognized share-based compensation cost	$ 18,000
Costs are expected to be recognized over a weighted average period	2.1
Cash received from stock option exercises	1,681	1,747	1,226
Dividend yield assumption	0.00%	0.00%	0.00%
University made discretionary matching contributions	$ 925	$ 745	$ 522
Minimum eligible age to participate in the plan	21
Vesting period	5 years
Expiration period of option vested	10 years

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Expiration period of option vested.

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Percentage increase in shares authorized for issuance.

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Share-based compensation arrangement by Share-based payment award equity instruments other than options grants weighted average grant date fair value.

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Stock granted , shares, share-based compensation shares of common stock.

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The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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