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Schedule of Disclosure of Share-based Compensation Arrangements by Share-based Payment Award (Details) (USD $)				9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2012 Range 1 [Member]	Dec. 31, 2011 Range 1 [Member]	Sep. 30, 2012 Range 2 [Member]	Dec. 31, 2011 Range 2 [Member]	Sep. 30, 2012 Range 3 [Member]	Dec. 31, 2011 Range 3 [Member]	Sep. 30, 2012 Range 4 [Member]	Dec. 31, 2011 Range 4 [Member]
Exercise price lower range limit				$ 4.5	$ 4.5	$ 9	$ 9	$ 13.5	$ 13.5	$ 19.2	$ 19.2
Exercise price upper range limit				$ 8.7	$ 8.7	$ 12.9	$ 12.9	$ 18.9	$ 18.9	$ 23.85	$ 23.85
Weighted Average Remaining Contractual Life - Years	5 years 1 month 2 days	5 years 8 months 8 days		6 years 6 months 7 days	7 years 25 days	5 years 2 months 12 days	5 years 29 days	3 years 6 months 22 days	4 years 3 months 4 days	2 years 10 months 24 days	3 years 7 months 24 days
Number of options outstanding	1,639,842	1,674,065	1,772,348	844,801	871,195	130,037	152,340	358,336	343,862	306,668	306,668
Number of Awards Vested	1,520,793	1,345,541		725,752	542,671	130,037	152,340	358,336	343,862	306,668	306,668
Weighted Average Exercise Price	$ 11.83	$ 12.62		$ 6.27	$ 6.48	$ 10.46	$ 10.51	$ 14.17	$ 14.14	$ 22.84	$ 22.84

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Weighted Average Remaining Contractual Life - Years

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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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-Publisher FASB

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-Number 123R

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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-Number 123R

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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