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Accounting for Stock- Based Compensation (Tables)

9 Months Ended

Sep. 30, 2012

Accounting for stock-based compensation [Abstract]

Summarized details of stock-based compensation expense recognized in the accompanying condensed consolidated statements of operations

		Three months ended September 30,								Nine months ended September 30,
		2012				2011				2012				2011
Stock-based compensation		$	3,820			$	3,321			$	9,770			$	8,023

Assumptions used to calculate fair of employee stock options

		Performance-based		Time-based
Risk-free interest rate		0.20% — 0.29%		0.83%
Expected lives		0.96 — 1.87 years		6.08 years
Volatility		62.35% — 70.56%		81.81%
Dividends		—		—

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- Definition

Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value.

+ References

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- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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