Share Based Compensation (Stock option plans) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock Options - Shares [Abstract]
Shares - Outstanding	3,713	3,587	3,707
Shares - Granted	186	402	385
Shares - Exercised	(341)	(274)	(496)
Shares - Forfeited or expired	(432)	(2)	(9)
Shares - Outstanding	3,126	3,713	3,587	3,707
Shares - Exercisable	2,509	2,715	2,622
Stock Options - Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price - Outstanding	$ 17.85	$ 16.69	$ 14.14
Weighted Average Exercise Price - Granted	$ 23.35	$ 19.31	$ 29.07
Weighted Average Exercise Price - Exercised	$ 7.70	$ 4.81	$ 7.17
Weighted Average Exercise Price - Forfeited or expired	$ 20.34	$ 20.10	$ 20.80
Weighted Average Exercise Price - Outstanding	$ 18.93	$ 17.85	$ 16.69	$ 14.14
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 18.01	$ 16.48	$ 14.51
Stock Options - Contractual Term [Abstract]
Weighted Average Remaining Contractual Term (years)	4 years 2 months 0 days	5 years 0 months 0 days	5 years 1 month 0 days	5 years 2 months 0 days
Weighted Average Remaining Contractual Term - Exercisable	3 years 3 months 0 days	3 years 8 months 0 days	3 years 11 months 0 days
Stock Options - Aggregate Intrinsic Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 17,461	$ 9,744	$ 22,299	$ 47,891
Intrinsic Value - Exercised	5,722	4,249	11,120
Intrinsic Value - Exercisable	$ 16,144	$ 9,472	$ 20,201

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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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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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

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

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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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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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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

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