Stock-Based Compensation (Shares Available For Grant) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2014	Dec. 31, 2013
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	4,333	4,126
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 4.84	$ 5.68
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	6 years 8 months 19 days	5 years 9 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 245	$ 87
Shares Available For Grant [Roll Forward]
Beginning balance (shares)	4,908
Annual increase in shares available for grant (shares)	1,525
Grants (shares)	(870)
Forfeited / cancelled (shares)	195
Ending balance (shares)	5,356	4,908
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	870
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 1.94
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	(62)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 1.01
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	$ 40
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	(601)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 6.77
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms	1 year 0 months 25 days	1 year 1 month 6 days
Shares Available For Grant [Roll Forward]
Grants (shares)	(75)
Award shares withheld for taxes (shares)	123
Forfeited / cancelled (shares)	196
Restricted Stock Award [Member]
Shares Available For Grant [Roll Forward]
Grants (shares)	(229)
Performance stock units [Member]
Shares Available For Grant [Roll Forward]
Grants (shares)	(775)
Forfeited / cancelled (shares)	358

Share Based Compensation Arrangement By Share Based Payment Award Number Of Awards Released During Period

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Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized During Period

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Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Forfeited or Cancelled During Period

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Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Granted During Period

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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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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- 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

-Name Accounting Standards Codification

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- Definition

For presentations that combine terminations, 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 or that expired.

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-Publisher FASB

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-SubTopic 10

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-Paragraph 2

-Subparagraph (c)(1)(iv)(3)-(4)

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- Definition

Weighted average price of options that were either forfeited or expired.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-Subparagraph (c)(1)(iv)(3)-(4)

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- Definition

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

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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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