Stockholders' Equity and Stock-Based Compensation Plans (Details) (Stock Options Plan [Member], USD $)	3 Months Ended
Mar. 31, 2013
Summary of transactions of the Company's stock option plans
Outstanding, Number of Options, Beginning balance	1,001,241
Exercised, Number of Options	(195,478)
Forfeited, Number of Options	(4,438)
Outstanding, Number of Options, Ending balance	870,461
Outstanding, Weighted Average Exercise Price, Beginning balance	$ 6.27
Exercised, Weighted Average Exercise Price	$ 2.17
Forfeited, Weighted Average Exercise Price	$ 22.48
Outstanding, Weighted Average Exercise Price, Ending balance	$ 7.60
Discount [Member]
Summary of transactions of the Company's stock option plans
Granted, Number of Options	48,083
Granted, Weighted Average Exercise Price	$ 0.00
Granted, Weighted Average Grant-Date Fair Value	$ 32.14
Market Value [Member]
Summary of transactions of the Company's stock option plans
Granted, Number of Options	21,053
Granted, Weighted Average Exercise Price	$ 41.31
Granted, Weighted Average Grant-Date Fair Value	$ 16.09

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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 grantees can acquire the shares reserved for issuance under the stock option plan.

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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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