v2.4.0.6

Stockholders' Equity (Stock Option Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stockholders' Equity [Abstract]
Option outstanding, Beginning balance	1,713,165	993,279	1,453,370
Option granted, Number of Shares	0	1,043,045
Option exercised, Number of Shares	203,894	308,084	420,583
Option forfeited, Number of Shares	82	5,628	36,689
Option expired, Number of Shares	1,670	9,447	2,819
Option outstanding, Ending balance	1,507,519	1,713,165	993,279
Weighted-Average Exercise Price, Outstanding beginning balance	$ 11.68	$ 2.11	$ 2.26
Weighted-Average Exercise Price, Granted	$ 0.00	$ 18.21
Weighted-Average Exercise Price, Exercised	$ 1.82	$ 3.22	$ 2.19
Weighted-Average Exercise Price, Forfeited	$ 9.29	$ 9.65	$ 7.01
Weighted-Average Exercise Price, Expired	$ 5.91	$ 4.72	$ 4.87
Weighted-Average Exercise Price, Outstanding ending balance	$ 13.02	$ 11.68	$ 2.11
Option exercisable, Number of Shares	464,451
Option Exercisable, Weighted-Average Exercise Price	$ 1.38

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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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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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The decrease in the number of shares that could be issued attributable to the lapse of rights to exercise previously issued stock options under the terms of the option agreements under the plan during the reporting period.

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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that lapsed during the reporting period.

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

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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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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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