Stock-Based Compensation (Schedule of Share-based Compensation, Stock Options, Activity) (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Stock-Based Compensation [Abstract]
Shares outstanding, beginning balance	87,436	159,517
Shares exercised		(45,163)
Shares forfeited		(26,918)
Shares outstanding, ending balance	87,436	87,436
Shares, exercisable	87,436	87,436
Weighted average exercise price outstanding, beginning balance	$ 23.60	$ 20.12
Weighted average exercise price exercised		$ 15.89
Weighted average exercise price forfeited		$ 15.89
Weighted average exercise price outstanding, ending balance	$ 23.60	$ 23.60
Weighted average exercise price exercisable	$ 23.60	$ 23.60
Aggregate intrinsic value outstanding, beginning balance		$ 347,000
Aggregate intrinsic value exercised		207,000
Aggregate intrinsic value exercisable	$ 0	$ 0

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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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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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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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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 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 that were terminated.

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

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