Stock Based Compensation and Other Benefit Plans (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted	725,643
Dividend yield ratio	0.00%
Total intrinsic value of options exercised	$ 2.5	$ 1.9	$ 0
Additional grants cash-settled stock appreciation rights	0
Total cash from option exercises	3.6	3.6	0
Performance Based Awards Granted Shares	0
Compensation cost	2.1	1.8	2.9
Tax Benefit from Stock Options Exercised	0.8	0.6	0
Stock Based Compensation And Other Benefit Plans (Textual) [Abstract]
Defined Contribution Plan	Participants’ contributions, up to 3% of compensation, are matched 100% by us, and the participants’ contributions, from 3% to 6% of compensation, are matched 50% by us.
Cash contributions	2.8	1.7	1.5
Voluntary Contribution by employer	50.00%
Participant's Contribution as a percentage of compensation	0.30%
Maximum Participant's Contribution as a percentage of compensation	0.60%
Percentage of compensation matched by employer if participants contribution is minimum	100.00%
Percentage of compensation matched by employer if participant's contribution is maximum	50.00%
2003 Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares remained available for award	230,433
Maximum no of shares granted in the form of common stock equivalents and restricted stock awards		50,000
Maximum no of shares of common stock issued	1,000,000
Period of performance-based restricted stock units, granted	3 years
2004 Non-Employee Directors' Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares remained available for award	365,088
Value of Restricted Stock Issued by non employee directors	125,000
2006 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares remained available for award	2,727,081
Number of shares authorized before amendment	5,000,000
Maximum no of shares of common stock issued	8,000,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, Minimum	P3Y
Vesting period, Maximum	P4Y
Period granted for Stock Option by the Compensation Committee	10 years
Options granted, Term period	10 years
Options granted	725,643
Cash Settled Stock Appreciation Right [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Per share value used for calculating cash settlement of stock appreciation rights	$ 7.89
Fair market value of cash-settled appreciation right	$ 1.61
Liability related to stock appreciation right	0.5
Performance Based Restricted Stock Units and Cash Settled Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares remaining under award were forfeited	381,230
Compensation cost	0
Reversal of Previous Liability			0.6
Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, Minimum	3 Year
Vesting period, Maximum	4 Year
Compensation cost	2.8	1.8	1.4
Total unrecognized compensation cost	7.8
Expected recognized period of restricted stock awards	2.7
Total fair value of shares vested	3.2	1.2	0.6
Tax Benefit from Stock Options Exercised	$ 1.1	$ 0.6	$ 0.4

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Dividend yield ratio.

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Maximum participant contribution as percentage of compensation.

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Percentage of voluntary contribution by employer.

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Share based compensation arrangement by share based payment award maximum number of shares authorized for each year.

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Share based compensation arrangement by share based payment award number of shares authorized before amendment.

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Share based compensation arrangement by share based payment award options granted period.

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Stock issued during period shares restricted stock award remaining shares forfeited.

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The increase in the fair value of plan assets from contributions made by the employer.

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Description of the terms and benefits provided by the employer's defined contribution plans. A defined contribution plan provides benefits in return for services rendered, provides an individual account for each participant, and has terms that specify how contributions to the individual's account are to be determined rather than the amount of benefits the individual is to receive. Under a defined contribution pension plan, the benefits a participant will receive depend solely on the amount contributed to the participant's account, the returns earned on investments of those contributions, and forfeitures of other participants' benefits that may be allocated to such participant's account. A description of the plan(s) including employee groups covered, the basis for determining contributions, and the nature and effects of significant matters affecting comparability of information for all periods presented.

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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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The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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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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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 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 total fair value of equity-based awards 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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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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

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-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(d)

-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.

Reference 2: 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)(1)

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

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