v2.3.0.15

COMPENSATION PLANS (Details) (USD $)			3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011 Common Stock awards	Sep. 30, 2011 Restricted common stock	Sep. 30, 2010 Restricted common stock	Sep. 30, 2011 Restricted common stock	Sep. 30, 2010 Restricted common stock	Mar. 31, 2011 Grants made to newly hired employees	Sep. 30, 2011 Grants made to newly hired employees	Sep. 30, 2011 Stock options Y	Sep. 30, 2010 Stock options	Sep. 30, 2011 Stock options Y entity	Sep. 30, 2010 Stock options Y
Compensation plans
Common stock available for issuance (in shares)	4,100,000
Common stock shares approved by Board of Directors (in shares)		9,616
Portion of shares vesting on each anniversary date of the grant							one-third				one-third
The period over which grants vest (in years)							First three anniversary dates
Typical minimum vesting period of awards (in years)								2
Typical maximum vesting period of awards (in years)								4
Total compensation expense			$ 800,000	$ 700,000	$ 2,700,000	$ 2,100,000			$ 400,000	$ 200,000	$ 1,100,000	$ 700,000
Total unrecognized compensation expense			3,500,000		3,500,000				2,500,000		2,500,000
Non-vested restricted common stock, number of shares
Non-vested restricted common stock, at beginning of period (in shares)					217,794
Granted (in shares)					61,585
Vested (in shares)					(98,744)
Forfeited (in shares)					(8,775)
Non-vested restricted common stock, at end of period (in shares)			171,860		171,860
Non-vested restricted common stock, additional disclosures
Non-vested restricted common stock, at beginning of period (in dollars per share)					$ 27.96
Granted (in dollars per share)					$ 35.80
Vested (in dollars per share)					$ 28.11
Forfeited (in dollars per share)			$ 30.77		$ 30.77
Non-vested restricted common stock, at end of period (in dollars per share)			$ 30.53		$ 30.53
The number of periods, at the anniversary dates of the grant, over which the award vests (in years)											three years
Assumptions used to compute weighted average fair value of options granted
Risk free interest rate (as a percent)											2.60%	2.70%
Estimated volatility (as a percent)											56.60%	56.70%
Expected option life (in years)											6	6
Number of peer companies used to determine estimated volatility when calculating fair value of options granted											3
Stock option activity, number of shares
Outstanding non-qualified stock options, at beginning of period (in shares)											273,851
Granted (in shares)											102,196
Exercised (in shares)											(14,739)
Forfeited (in shares)											(6,969)
Outstanding non-qualified stock options, at end of period (in shares)									354,339		354,339
Vested or expected to vest, end of period (in shares)									339,487		339,487
Exercisable non-qualified stock options, at end of period (in shares)									131,887		131,887
Stock Options, Weighted Average Exercise Price
Outstanding non-qualified stock options, at beginning of period (in dollars per share)											$ 22.69
Granted (in dollars per share)									$ 35.69		$ 35.69
Exercised (in dollars per share)									$ 22.33		$ 22.33
Forfeited (in dollars per share)									$ 30.35		$ 30.35
Outstanding non-qualified stock options, at end of period (in dollars per share)									$ 26.31		$ 26.31
Vested or expected to vest, end of period (in dollars per share)									$ 26.00		$ 26.00
Exercisable non-qualified stock options, at end of period (in dollars per share)									$ 22.00		$ 22.00
Stock Options, Aggregate Intrinsic Value
Outstanding non-qualified stock options, at end of period									619,153		619,153
Vested or expected to vest, at end of period									617,544		617,544
Exercisable non-qualified stock options, at end of period									$ 401,823		$ 401,823
Stock Options, Weighted Average Remaining Contractual Life
Outstanding non-qualified stock options, at end of period (in years)									8.2		8.2
Vested or expected to vest, end of period (in years)											8.2
Exercisable non-qualified stock options, at end of period (in years)											7.7
Stock Options, Weighted Average Grant-Date Fair Value
Outstanding non-qualified stock options, at beginning of period (in dollars per share)											$ 10.69
Granted (in dollars per share)											$ 19.59
Exercised (in dollars per share)											$ 10.02
Forfeited (in dollars per share)											$ 16.29
Outstanding non-qualified stock options, at end of period (in dollars per share)									$ 13.17		$ 13.17
Vested or expected to vest, end of period (in dollars per share)											$ 12.95
Exercisable non-qualified stock options, at end of period (in dollars per share)											$ 9.85

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

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

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Description of the estimated period of time over which an employee is required to provide service in exchange for the equity-based payment award, which often is the vesting period. This period may be explicit or implicit based on the terms of the award, and may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

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Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

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The maximum vesting term over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition.

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The minimum vesting term over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition.

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph d(1)

-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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

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

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- Definition

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28,29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(2)

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



Reference 5: http://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5



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-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

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-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

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