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Performance based awards eliminated minimum vesting period.

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Share based compensation arrangement by share based payment award award contractual term.

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No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph g(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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Aggregate unrecognized cost of share-based awards, other than options, made to employees under an equity-based compensation plan, that have yet to vest.

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No definition available.

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- Definition

Aggregate unrecognized cost of option awards made to employees under a stock option plan or plans, that have yet to vest.

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No definition available.

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- Definition

Period 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, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

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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- Definition

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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- Definition

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph a

-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

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-Paragraph 2

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

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Equity Incentive Plans (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Equity Incentive Plans (Textual) [Abstract]
Shares vested related to grants of restricted stock and restricted stock	2,592,000	260,000	200,000
Total unrecognized compensation expense employee stock option plans	$ 1.4
Minimum [Member]
Equity Incentive Plans (Textual) [Abstract]
Stock options vesting period	1 year
Maximum [Member]
Equity Incentive Plans (Textual) [Abstract]
Stock options vesting period	3 years
2004 Plan [Member] \| Class A Common Stock [Member]
Equity Incentive Plans (Textual) [Abstract]
Common stock shares authorized under 2000 plan and 2004 plan	10,000,000	10,000,000
2000 Plan [Member] \| Class A Common Stock [Member]
Equity Incentive Plans (Textual) [Abstract]
Common stock shares authorized under 2000 plan and 2004 plan	11,500,000	11,500,000
Stock Options [Member]
Equity Incentive Plans (Textual) [Abstract]
Stock options vesting period	4 years
Stock-based compensation expense related to employee stock option plans	1.6	0.7	1.4
Weighted average period for unrecognized compensation expense related to grants of stock options	1 year 3 months 18 days
Stock Options [Member] \| Minimum [Member]
Equity Incentive Plans (Textual) [Abstract]
Stock options vesting period	4 years
Stock Options [Member] \| Maximum [Member]
Equity Incentive Plans (Textual) [Abstract]
Stock options vesting period	5 years
Stock Options [Member] \| 2004 Plan [Member]
Equity Incentive Plans (Textual) [Abstract]
Contractual term of stock options	10 years
Stock Options [Member] \| 2000 Plan [Member]
Equity Incentive Plans (Textual) [Abstract]
Contractual term of stock options	10 years
Restricted Stock and Restricted Stock Units [Member]
Equity Incentive Plans (Textual) [Abstract]
Stock-based compensation expense related to grants of restricted stock and restricted stock units		1,003,000	875,000
Performance based restricted stock and restricted stock units, eliminated minimum vesting period under amended 2004 plan	3 years
Stock-based compensation expense related to employee stock option plans	1.0	1.6	1.6
Weighted average period for unrecognized compensation expense related to grants of stock options	8 months 12 days
Total unrecognized compensation expense related to grants of restricted stock and restricted stock units	0.4
Shares vested related to grants of restricted stock and restricted stock	$ 1.3	1.3	2.2