Awards granted to executives under Performance Award Agreement.

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Amount paid to acquire vested shares.

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

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No definition available.

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Number of stock issued during the period other than stock options exercised, net of offsets for withholding taxes.

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Number of vested shares acquired to cover minimum withholding taxes.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)

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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

The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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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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-Name Accounting Standards Codification

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- Definition

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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-Subparagraph (c)(2)(i)-(ii)

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- Definition

Amount of liabilities paid for share-based compensation.

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- Definition

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

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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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-Paragraph 2

-Subparagraph (a)(3)

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- Definition

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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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

+ References

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-Paragraph 2

-Subparagraph (c)(1)(iii)

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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-Publisher FASB

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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-Subparagraph (c)(1)(iv)(3)

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- Definition

Number of options outstanding, including both vested and non-vested options.

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- Definition

The increase or decrease in number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding, including vested options.

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Number of share options (or share units) exercised during the current period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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Share-Based and Long-Term Compensation (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended	3 Months Ended			1 Months Ended				3 Months Ended
	Mar. 31, 2014 Equity Incentive Plan 2010 [Member]	Dec. 31, 2013 Equity Incentive Plan 2010 [Member]	Mar. 31, 2014 Employee Stock Option [Member]	Mar. 31, 2013 Employee Stock Option [Member]	Dec. 31, 2013 Employee Stock Option [Member]	Mar. 06, 2014 Restricted Stock [Member]	Mar. 01, 2014 Restricted Stock [Member]	Mar. 06, 2013 Restricted Stock [Member]	Mar. 01, 2013 Restricted Stock [Member]	Mar. 31, 2014 Restricted Stock [Member]	Mar. 31, 2013 Restricted Stock [Member]	Mar. 31, 2014 Performance Award Agreements [Member]	Mar. 31, 2013 Performance Award Agreements [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)	4,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)	1,086,832
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease)		850,000
Stock or Unit Option Plan Expense			$ 0.4	$ 0.5								$ 1.1	$ 0.1
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized			1.0							4.5
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition			11 months							14 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares)			683,238		742,384
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term			8 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)			53,444
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value			0.7
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number			511,822
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value			7.6
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period			5,702
Restricted Stock or Unit Expense										0.8	0.7
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number										695,641
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Forfeited In Period										2,650
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Description						one third of the RSUs granted on March 6, 2012 and one third of the RSUs granted on March 5, 2013 vested	one third of the RSUs granted on March 3, 2011 vested	one third of the RSUs granted on March 6, 2012 vested	one third of the RSUs granted on March 3, 2011 vested
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period						77,411	25,995	40,305	26,837
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value						2.0	0.7	0.5	0.3
Stock Issued During Period, Shares, Stock Options Exercised Net of Offsets for Withholding Taxes (in shares)						52,163	17,366	27,164	17,934
Payments to Acquire Vested Shares						0.7	0.2	0.2	0.1
Vested Shares Acquired to Cover Minimum Withholding Taxes One (in shares)						25,248	8,629	13,141	8,903
Awards Granted to Executives Under Performance Award Agreement	approximately 80 executives on March 5, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid												$ 2