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Condensed Consolidated Statement of Changes in Stockholders' Equity (USD $) In Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]
Balance at Dec. 31, 2011	$ 634,238	$ 921	$ (602)	$ 647,374	$ (13,455)
Balance, shares at Dec. 31, 2011		92,461	22
Stock-based compensation, shares		952
Stock-based compensation	6,627			6,627
Vesting of restricted shares		2		(2)
Treasury stock - tax withholdings, shares		(44)	44
Treasury stock - tax withholdings	(1,299)		(1,299)
Net income	110,798				110,798
Balance at Sep. 30, 2012	$ 750,364	$ 923	$ (1,901)	$ 653,999	$ 97,343
Balance, shares at Sep. 30, 2012		93,369	66

X

- Definition

The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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Changes in additional paid in capital related to exercise of share-based payments awards (such as stock options) and the amount of recognized equity-based compensation during the period (such as nonvested shares).

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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-Name Emerging Issues Task Force (EITF)

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- Definition

The value of restricted shares issued as compensation, net of the value of shares for the payment of withholding taxes. This element is to be used only if shares are used in lieu of cash to satisfy all or a portion of withholding taxes.

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No definition available.

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Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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