Stock-Based Compensation (Stock-Based Compensation, Stock Options) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Stock-Based Compensation [Abstract]
Number of Shares, Options outstanding, Beginning Balance	280,175
Number of Shares, Exercised	(93,092)
Number of Shares, Cancelled	(3,716)
Number of Shares, Options outstanding, Ending Balance	183,367
Number of Shares, Options vested and exercisable	183,367
Weighted Average Exercise Price, Options outstanding, Beginning Balance	$ 9.66
Weighted Average Exercise Price, Exercised	$ 8.70
Weighted Average Exercise Price, Cancelled	$ 0.03
Weighted Average Exercise Price, Options outstanding, Ending Balance	$ 10.33
Weighted Average Exercise Price, Options vested and exercisable	$ 10.33
Aggregate Intrinsic Value, Options outstanding as of December 31, 2013	$ 5,177
Aggregate Intrinsic Value, Options vested and exercisable as of December 31, 2013	$ 5,177
Weighted Average Remaining Contractual Term, Options outstanding at December 31, 2013	2 years 9 months 4 days
Weighted Average Remaining Contractual Term, Options vested and exercisable as of December 31, 2013	2 years 8 months 9 days

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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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 of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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Weighted average remaining contractual term for fully vested and expected to vest options that are 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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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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

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