Share-based Payment Arrangements (Summary of the Status of Stock Options) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Payment Arrangements [Abstract]
Stock options, Outstanding at January 1, 2014	1,387,489
Stock options, Granted	0	0	0
Stock options, exercised (in shares)	(135,359)
Stock options, forfeited or expired	(189,996)
Stock options, Outstanding at December 31, 2014	1,062,134	1,387,489
Stock options, Exercisable at December 31, 2014	948,561
Weighted Average Exercise Price, Outstanding at January 1, 2014	$ 9.66
Weighted Average Exercise Price, Exercised	$ 8.53
Weighted Average Exercise Price, Forfeited or expired	$ 11.29
Weighted Average Exercise Price, Outstanding at December 31, 2014	$ 9.51	$ 9.66
Weighted Average Exercise Price, Exercisable at December 31, 2014	$ 9.85
Average Remaining Contractual Term, Outstanding at December 31, 2014 (in years)	3 years 3 months 18 days
Average Remaining Contractual Term, Exercisable at December 31, 2014 (in years)	3 years 2 months 12 days
Aggregate Intrinsic Value, Outstanding at December 31, 2014	$ 2,877
Aggregate Intrinsic Value, Exercisable at December 31, 2014	$ 2,260

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

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

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

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