Stock Options (Details) (Employee Stock Option [Member], USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, Outstanding at January 1, 2015 (in shares)	3,641,857
Number of Options, Granted (in shares)	0
Number of Options, Exercised (in shares)	0
Number of Options, Forfeited/Expired (in shares)	(20,354)
Number of Options, Outstanding at March 31, 2015 (in shares)	3,621,503
Number of Options, Exercisable at March 31, 2015 (in shares)	1,353,232
Number of Options, Vested and Expected to Vest at March 31, 2015 (in shares)	3,621,503
Weighted - Average Exercise Price, Outstanding at January 1, 2015 (in dollars per share)	$ 3.05
Weighted - Average Exercise Price, Granted (in dollars per shares)	$ 0
Weighted - Average Exercise Price, Exercised (in dollars per share)	$ 0
Weighted - Average Exercise Price, Forfeited/Expired (in dollars per share)	$ 3.08
Weighted - Average Exercise Price, Outstanding at March 31, 2015 (in dollars per share)	$ 3.05
Weighted - Average Exercise Price, Exercisable at March 31, 2015 (in dollars per share)	$ 3.05
Weighted - Average Exercise Price, Vested and Expected to Vest at March 31, 2015 (in dollars per share)	$ 3.05
Weighted - Average Remaining Contractual Term, Outstanding at March 31, 2015 (in years)	4 years 8 months 1 day
Weighted - Average Remaining Contractual Term, Exercisable at March 31, 2015 (in years)	3 years 4 months 20 days
Weighted - Average Remaining Contractual Term, Vested and Expected to Vest at March 31, 2015 (in years)	4 years 8 months 1 day
Aggregate Intrinsic Value, Outstanding at March 31, 2015	$ 43,800
Aggregate Intrinsic Value, Exercisable at March 31, 2015	35,450
Aggregate Intrinsic Value, Vested and Expected to Vest at March 31, 2015	$ 43,800

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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.

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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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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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

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

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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options 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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