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Stock-Based Compensation (Details 1) (Stock Options [Member], USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Stock Options [Member]
Balance, beginning	30,628
Exercised, (in shares)	13,192
Balance, ending	17,436
Exercisable, (in shares)	17,436
Outstanding, weighted average exercise price	$ 17.79
Exercised, weighted average exercise price	$ 16.47
Outstanding, weighted average exercise price	$ 18.79
Exercisable, weighted average exercise price	$ 18.79
Outstanding, average remaining contractual term years, beginning	0.84
Outstanding, average remaining contractual term years, ending	0.52
Exercisable, average remaining contractual term years	0 years 6 months 7 days
Outstanding, aggregate intrinsic value	$ 545
Outstanding, aggregate intrinsic value	374
Exercisable, aggregate intrinsic value	$ 374

X

- Definition

The weighted average period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

+ References

No definition available.

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- Definition

The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

+ References

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Number of share options (or share units) exercised during the current period.

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